Single-celled microorganisms that can exist either as independent (free-living) organisms or as parasites (dependent on another organism for life). The plural of bacterium. Examples of bacteria include Acidophilus, a normal inhabitant of yogurt; Gonococcus which causes gonorrhea; Clostridium welchii, the most common cause of gangrene; E. coli, whic [..]

A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.

Simple single celled prokaryotic organisms. Many different species of bacteria exist. Some species of bacteria can be pathogenic causing disease in larger more complex organisms. Many species of bacte [..]

One of two prokaryotic domains, the other being the Archaea.

1847, plural of Modern Latin bacterium, from Greek bakterion "small staff," diminutive of baktron "stick, rod," from PIE *bak- "staff used for support" (also source of La [..]

bacteriophobia

One of five types of microorganisms that commonly causes disease, characterized by absence of a nucleus and endoplasmic reticulum. Bacteria are classified according to their shape and are designated a [..]

(singular: bacterium) single-celled organisms found in every ecosystem on Earth.

Bacteria are small single-celled organisms. Bacteria are found almost everywhere on Earth and are vital to the planet's ecosystems. Some species can live under extreme conditions of temperature and pressure. The human body is full of bacteria, and in fact is estimated to contain more bacterial cells than human cells. Most bacteria in the body [..]

Micro-organisms which can cause disease but have an important role in global ecology.

Tiny, invisible organisms. Some are harmful, others can stimulate growth

Microscopic, one-celled organisms that lack chlorophyll and may be parasites on plants or animals, causing disease; most are beneficial agents of fermentation and decay of organic matter.

Single celled organisms that require a host plant or some other organic material as a food source.

single-celled microscopic organisms that lack a nucleus. There are many types of bacteria, both good and bad

Single celled organisms that require a host plant or some other organic material as a food source.

(Plural form) Eubacteria are the true bacteria, including the blue-green algae, as well as the chloroplasts and mitochodria surviving as organelles

A bacteria is a simple microscopic single-celled organism. There are many forms of bacteria which thive in soil. Bacteria play a crucial role in the nutrient cycles in soil, helping to break down orga [..]

Single-celled microorganisms.

single-celled prokaryotic organisms (prokaryotic means: DNA not enclosed in a cell nucleus), many microscopic. Early in Earth's history, bacteria gradually altered the environment to support more complex forms of life (producing oxygen, for instance, in the atmosphere) even while moving into cells as organelles and decomposing organic matter i [..]

These are microscopic primitive organisms existing in their countless millions everywhere, soil contains vast numbers of them, mostly beneficial to plants. Aerobic bacteria require air to exist and break down decaying matter in the soil into soluble foods which can be taken up for healthy plant growth by the roots. Anaerobic bacteria can live witho [..]

(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy i [..]

Microorganisms often composed of a single cell.

disease-germ, microbe

a class of organisms known as Prokaryotes in which the cell has no nucleus. They are single-cell microbes which can be found virtually everywhere. They 'eat' almost anything which lends them [..]

Single-celled prokaryotes that can be free-living or live as parasites.

very small, one-celled organisms that have no chlorophyll.

mycobacterium

bacillus

A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.

Living things that have only one cell and are so small they can only be seen with a microscope.

Microscopic organisms that enter the BioCosmos

a single-celled microorganism that lacks a nucleus

Single-celled microorganisms, about one micrometer (one thousand nanometers) across.

microorganisms that live in the soil and convert nutrients into forms usable by plants Bovine:

one-celled organisms that reproduce rapidly under strict temperature, pH, and other conditions. (Bacteria can be killed with disinfectants.)

Single cell organisms and most prevalent form of life on Earth. Bacteria are also known as prokaryotes (together with archaea; formerly archaebacteria) referring to the single compartment inside the cell and missing a membrane delineated cell nucleus found in all eukaryotes. Examples are Escherichia coli (E.coli), Salmonella typhimurium (S. typhi), [..]

one of the five kingdoms of living beings. Bacteria are structurally simple single cells with no nucleus.

One of the three domains of life. These are species that do not have nuclei and thus were originally grouped with archaea

Microscopic, single-celled organisms. They include the photosynthetic cyanobacteria (formerly called blue-green algae), and actinomycetes (filamentous bacteria that give healthy soil its characteristic smell).

Very small living organisms made of only one cell which are present everywhere (the air, the soil, on the skin). Many types of bacteria can cause diseases, but others can be very helpful to humans.

a very large group of microorganisms comprising one of the three domains of living organisms Bacteria are prokaryotic, unicellular, and either free-living in soil or water or parasites of plants or an [..]

Single celled organisms that reproduce by cell division may be either unintentional contaminants (spoilage or pathogenic organisms) of muscle foods or intentional additives such as the lactic acid sta [..]

Bacteria are single-celled organisms that live in and around us. Bacteria are necessary for us to function normally, but in some conditions may cause sickness such as strep throat, ear infections, or [..]

Microscopically small single-cell organisms, that reproduce by fission of spores.

A single-celled organism that can live and proliferate in bedding under the right conditions. The use of a mattress protector prevents bacteria growth in bedding materials.

One-celled living organisms, typically about one micron in diameter. Bacteria are among the oldest, simplest, and smallest types of cells.

Single-celled micro-organisms that can exist as independent organisms or parasites. Some are harmful and some are beneficial to humans.

microorganisms that can cause infections.

a disease-causing organism

Large group of single-celled micro-organisms which can be both harmful and helpful to food.

Living single-celled organisms. They can be carried by water, wind, insects, plants, animals, and people. Bacteria survive well on skin and clothes and in human hair. They also thrive in scabs, scars, [..]

Bacteria are a type of microorganism that can be found in soil, on animals, on people and on the things people touch and use. If food becomes contaminated by bacteria it can cause food poisoning if eaten. Consumption of food contaminated by bacteria is the most common cause of food poisoning.

Bacteria are found in all foods. Most are killed by high temperatures, but some form toxins which may or may not be killed by heat.

(n) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxono [..]

Bacteria are living things that have only one cell. Under a microscope, they look like balls, rods, or spirals. They are so small that a line of 1,000 could fit across a pencil eraser. Most bacteria w [..]

Tiny single-celled organisms. Some bacteria cause disease, although most are harmless.

Tiny organisms that may cause certain infections.

Very small organisms (microbes) that are normally in the gut (intestines). There are over 500 different kinds known to live in the gut; most (up to several billion) bacteria are in the large intestine [..]

; prokaryotic unicellular round, spiral, or rod-shaped single-celled microorganisms that live in soil, water, organic matter, or the bodies of plants and animals (singular bacterium.) Best Management Practice

any of a number of one-celled organisms, some of which cause disease

Any one of a group of very small living things. Bacteria are so small that they can only be seen through a microscope. Some kinds of bacteria cause disease. Others do useful things, like making soil richer.

Microscopic unicellular forms of life that cause infection and disease.

minute organisms that exist in the environment and in our body. There are billions of bacteria in the intestines. Some are harmless, while others may cause infection, particularly when the body’s resistance is lowered. However, others can be helpful in digestion and in destroying harmful organisms.

members of either of two kingdoms of one-celled living things that have no nucleus, or center, in their cell body.

A large, widely distributed group of one-celled microorganisms, chiefly parasitic or saprophytic. Some bacteria are disease producing; many are active in processes such as fermentation, the conversion of dead organic matter into soluble food for plants, and the fixing of atmospheric nitrogen.

Bacteria are a group of, usually single-celled, organisms that come in many different shapes, sizes and forms. They live almost anywhere on earth, including on humans. While many forms are not dangero [..]

Tiny living organisms that are made up of a single cell that does not have a distinct nucleus, such as a prokaryotic cell. Due to their ability to colonize even the most extreme environments, bacteria [..]

Single celled organism

any of numerous unicellular microorganisms of the class Schizomycetes, occurring in a wide variety of forms, existing either as free-living organisms or parasites, and having a wide range of biochemic [..]

(Singular: bacterium) Microscopic living organisms that can aid in pollution control by metabolizing organic matter in sewage, oil spills or other pollutants. However, bacteria in soil, water or air c [..]

(Singular: bacterium) Microscopic living organisms that can aid in pollution control by metabolizing organic matter in sewage, oil spills or other pollutants. However, bacteria in soil, water or air [..]

bacteria are naturally occurring microorganisms that are classified as either good or bad.

(Singular 'bacterium') Microscopic living organisms that can aid in pollution control by metabolizing organic matter in sewage, oil spills or other pollutants. However, bacteria in soil, wat [..]

One of the three domains of Life (the others being Eukarya and Archaea), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid Cell Walls, multiply by C [..]

A phylum of oxygenic photosynthetic Bacteria comprised of uniCellular to multiCellular Bacteria possessing Chlorophyll a and carrying out oxygenic Photosynthesis. CyanoBacteria are the only known orga [..]

Phylum of green nonsulfur Bacteria including the Family Chloroflexaceae, among others.

A phylum of anOxygenic, phototrophic Bacteria including the Family Chlorobiaceae. They occur in aquatic sediments, Sulfur springs, and Hot Springs and utilize reduced Sulfur Compounds instead of Oxyge [..]

A phylum of Bacteria consisting of the purple Bacteria and their relatives which form a branch of the euBacterial Tree. This group of predominantly Gram-Negative Bacteria is classified based on homolo [..]

A Family of phototrophic Bacteria, in the order Rhodospirillales, isolated from stagnant Water and mud.

A Family of phototrophic purple Sulfur Bacteria that deposit globules of elemental Sulfur inside their Cells. They are found in diverse aquatic Environments.

Single-celled organisms that probably provide the bulk of the biomass on our planet. There are more bacterial cells within your body than human cells. One of the most interesting things about bacteria is that our macroscopic concepts of 'species' are rather inappropriate - genetic material can be swapped from one 'species' to an [..]

One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by c [..]

All bacteria have a relatively simple cell structure lacking a cell nucleus and organelles such as mitochondria and chloroplasts. Most bacteria are relatively small and possess distinctive cell and co [..]

The plural form of the word bacterium.

Bacteria are single-celled microorganisms that serve many functions. Most bacteria are very useful. Some strains of bacteria are part of our natural digestion others help us produce foods like yogurt [..]

Primitive microorganisms smaller than yeast. Certain types of bacteria can infect wort and beer and result in off-flavors.

very small, single-celled life-forms that can reproduce quickly.

Bacteria are living organisms, microscopic in size, which usually consist of a single cell. Most bacteria feed on organic matter and produce waste products. Bacteria are everywhere—on everything we see and touch, and even in the air we breathe.

A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.

Micro-organisms (small living organisms that can only be seen with a microscope) smaller than a blood cell but bigger than a virus. Examples of infections caused by bacteria are diphtheria

A group of microscopic single-celled organisms. Some bacteria are capable of causing disease in humans and other organisms.

(Plural for bacterium

(Plural for bacterium). Tiny microorganisms that reproduce by cell division and usually have a cell wall. Bacteria can be shaped like a sphere, rod, or spiral and can be found in virtually any environ [..]

Tiny one-celled organisms present throughout the environment that require a microscope to be seen. While not all bacteria are harmful, some cause disease. Examples of bacterial disease include diphthe [..]

Tiny, one-celled organisms present throughout the environment that require a microscope to be seen. Bacteria can exist either as independent (free-living) organisms or as parasites (dependent upon another organism for life). While not all bacteria are harmful, some cause disease. Examples of bacterial disease include diphtheria, pertussis, tetanus, [..]

single-celled germs that can cause disease

Tiny microorganisms that reproduce by cell division and usually have a cell wall. Bacteria can be shaped like a sphere, rod, or spiral and can be found in virtually any environment.

Tiny one-celled organisms present throughout the environment that require a microscope to be seen. While not all bacteria are harmful, some cause disease. Examples of bacterial disease include diphthe [..]

Microscopic organisms from the Moneran Kingdom. Some bacteria are very helpful and others carry harmful diseases.

A single-celled microscopic plant-like organism that does not produce chlorophyll. It can cause disease in plants or in insects.

microscopic procaryotic organisms, which commonly have a spherical, rod, or spiral shape but are sometimes more complex (Glossary of PM)

Single-celled organisms that lack a cell nucleus. They are found in all living things and in all environments. Some bacteria can cause disease.

Bacteria constitute a large domain of prokaryotic microorganisms (unicellular organism without a nucleus). Human flora contains ten times more bacterial cells as there are human cells in the body, with the largest number being in the gut flora and on the skin.

Bacteria are one kind of microscopic (too small to see) germ. Many types of bacteria can make people sick or cause infections, and can be exposed to some of these when they have unprotected sex. There [..]

Single-celled prokaryotic organisms with a cell wall but no distinguishable organelles. Some are motile, others not. Various forms include spheres, rods and spirals,

Single-cell microorganisms which live in soil, water, air, plants, animals and humans. Many do not harm us, and some are helpful. But some cause disease by producing poisons.

(see

(see About bacteria and antibiotics

("bac-tear-E-ah"): microscopic single-celled organisms that together with archaea form the group "prokarya". Prokarya do not have nuclei. Some bacteria cause diseas [..]

Single-cell organisms that can infect tissue, multiply extremely rapidly, and secrete toxins (poisons) that kill healthy tissue cells and immune system cells.

Microscopic organisms that have a simple, one-celled structure and live in a variety of environments, including water, soil, plants and living bodies. Bacteria lack nuclei and endoplasmic reticulum.Th [..]

Living organisms, microscopic in size, which usually consist of a single cell. Most bacteria are harmless and very important in the environment. Most bacteria use organic matter for their food and produce waste products as a result of their life processes.

Bacteria are prokaryotic monocellular organisms. Most of them are 0.2 to 10μm in size and present a globe, rod, or line shape.

Simple life forms with one cell.

Microscopic single cell organisms found almost everywhere. Lactic acid-producing bacteria are useful and essential in the production of most cheeses. Bacteria linens A red bacteria which is encouraged to grow on the surfaces of cheeses like Brick, Havarti, Tilsit and Limburger, to produce a characteristic flavour. The full name of the organism is B [..]

Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometers in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on earth and are present in most of its habitats. (See also microorganisms below.)

Bacteria are unicellular (single cell) microorganisms belonging to the "prokaryote" kingdom of organisms. They are characterised by their lack of specialised internal organs or any organised nucleus. Bacteria are not visible to the human eye and are able to reproduce asexually, growing and dividing their cells at incredible speed. Bacteri [..]

Bacteria are microscopic living organisms they are a group of universally distributed, rigid, essentially unicellular, microscopic organisms lacking chlorophyll. They are characterized as spheroids, rod-like, or curved entities, but occasionally appearing as sheets, chains, or branched filaments.

Single-cell organisms that can infect tissue, multiply extremely rapidly, and secrete toxins (poisons) that kill healthy tissue cells and immune system cells.

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Single-cell microorganisms occurring naturally almost everywhere. They range from beneficial, to harmless, to deadly. Too small to be seen with the naked eye.

 A type of bug made up of just one cell, for example Salmonella

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

A unicellular micro-organism which exists either on its own or within another organism. Pathogenic

Very small, single-celled life-forms that can reproduce quickly. 

Commonly known as germs, bacteria are microorganisms found in and on food, people, surfaces, untreated water, dirt, soil, plants, animals and pests.

 Small organisms, some of which can cause disease

The smallest microscopic organism. Bacteria occur widely in nature and multiply rapidly. Certain species are active agents in fermentation. Lactic acid bacteria are important for cheesemaking as they transform the milk sugar, lactose, into lactic acid and help generate flavor during cheese ripening.

A large group of single-celled organisms that do not have organelles enclosed in membranes and have most of their DNA in a chromosome and the remainder in small circular plasmids. They have a cell wall composed of protein and complex carbohydrate over a plasma membrane.

Bacteria are small single-celled organisms. Bacteria are found almost everywhere on Earth and are vital to the planet’s ecosystems. Some species can live under extreme conditions of temperature and pressure. The human body is full of bacteria, and in fact is estimated to contain more bacterial cells than human cells. Most bacteria in the body are h [..]

single celled micro-organisms that can be free living or live in/on other organisms.  

Microscopic single-celled organisms lacking a nucleus. They are structured as either rod-shaped, sphere-shaped, or spiral-shaped. They can be aerobic or anaerobic, or facultative anaerobic.

are microscopic living organisms, usually one-celled, that can be found everywhere. They can be dangerous, such as when they cause infection, or beneficial as when found in the stomach or digestive sy [..]

Living single-celled organisms. Bacteria are found in all foods. Most are killed by high temperatures, but some form toxins which may or may not be killed by heat. They can be carried by water, wind, insects, plants, animals, and people. Bacteria survive well on skin and clothes and in human hair. They also thrive in scabs, scars, the mouth, nose, [..]

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Microscopically small living organisms usually consisting of a single cell (a few micrometers in length). Among the first live forms on earth. Bacteria are breaking down organic matter and are essenti [..]

A class of microscopic unicellular or filamentous organisms, without chlorophyll or a well defined nucleus. Break down organic remains. Other bacteria cause disease.

A microscopic organism that consists of a single cell

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Single-celled microorganisms (microbes) that exist in virtually all environments in the world. They exist in dirt, water, caves and hot springs, organic materials like fallen trees and dead animals, a [..]

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Bacteria are living organisms, microscopic in size, that usually consist of a single cell. Most bacteria use organic matter for their food and produce waste products as a result of their life processe [..]

[bak-teer-ee-uh] Very small microorganisms. Some types of bacteria enter the body from the air, water, soil, or food, and can cause infections and disease. Bacteria are the most common causes of infec [..]

Bacteria are germs with only one cell that can multiply into large numbers when food is in the danger zone for more than 4 hours.

Singular term for bacterium. Microscopic living organisms usually consisting of a single cell. Best Available Technology

Microscopic organisms with only one cell and has no nucleus. There are good bacteria that

A single cell micro-organism that may cause disease in plants, animals or humans.

Bacteria are unicellular (single cell) microorganisms belonging to the "prokaryote" kingdom of organisms. They are characterised by their lack of specialised internal organs or any organised [..]

A group of microscopic organisms, shaped like commas, rods, spheres or spirals found almost everywhere in air, water, soil and plants and animals.  Some bacteria cause disease, but most do not.

 A large group of single-cell microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium.

Single celled organisms found all around us, they can survive under many conditions including freezing.

Found in all natural environments, some bacteria can cause diseases in humans.

Single-cell organisms that can reproduce in the human gut and cause vomiting and diarrhea, bacteria also cause acute health problems that can kill AIDS and cancer patients. See chlorine, fecal colifor [..]

Single celled organisms capable of reproduction and growth. Bacteria can be beneficial or harmful.

The singular of bacterium, a microscopic, unicellular (or more rarely multicellular) organism.

These are unicellular microorganisms, some of which are harmful to man. Many different types of bacteria can be found in drinking water.

 single-celled living organisms, some of which can trigger infections in the reproductive system.

Microscopic organisms lacking chlorophyll. They obtain their energy from organic matter.

one-celled creatures that reproduce by splitting in half.

Bacteria are living organisms, microscopic in size, which usually consist of a single cell. Most bacteria feed on organic matter and produce waste products. Bacteria are everywhere—on everything we see and touch, and even in the air we breathe.

Small, single cell organisms that contaminate a pool or a spa. Bacteria can be introduced from the environment and by swimmers. Balanced Water

A single cell microorganism which can exist either as an independent organism or upon another organism for life. Bacteria can cause disease, spoil food, and contaminate water. The transmission of dise [..]

Bacteria are single-celled life forms visible only through a microscope. Bacteria live all around us and within us. Our lives are closely intertwined with theirs, and the health of our planet depends very much on their activities.

Unicellular prokaryotic organisms that lack a membrane-bounded nucleus.

Single cell microoganisms with rigid cell walls that multiply by dividing into two. Some bacteria cause illness, some will cause spoilage

Bacteria are single-celled microbes. The cell structure is simpler than that of other organisms, as there is no nucleus or membrane-bound organelles. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow. Some live in or on other organisms, including plants and animals, including humans. http://www.microbiologyonline [..]

Microscopic single-celled organisms lacking a nucleus. They are structured as either rod-shaped, sphere-shaped or spiral-shaped.

A group of single cell microorganisms that can cause disease by producing poisons that are harmful to human cells. The undamaged skin has natural substances that prevent bacteria from entering living tissues. Synthetic cosmetic materials can deplete these substances.

Bacteria are the smallest of microscopic organisms. Single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases (commonly called "germs").

Single celled organisms found all around us, they can survive under many conditions including freezing. Bactericide:

are a large domain of microbes that are present in most habitats on Earth, including the ocean and crust, and encompass a tremendous diversity of metabolisms. Bacteria are genetically distinct from Archaea and Eukarya, the other two domains of life on Earth. N.B. “bacteria” is the plural form of “bacterium.”

Simple single celled prokaryotic organisms. Many different species of bacteria exist. Some species of bacteria can be pathogenic causing disease in larger more complex organisms. Many species of bacteria play a major role in the cycling of nutrients in ecosystems through aerobic and anaerobic decomposition. Finally, some species form symbiotic rela [..]

Are living cells that, in favourable conditions, can multiply rapidly. Harmful bacteria, once inside the body, can release poisons or toxins which make us ill. Diseases caused by bacteria include: foo [..]

  Any microorganism of the class Schizomycetes. If they live on living organisms, they are called parasites; if their food is from nonliving organic matter, they are called saprophytes. If bacteria produce disease in their host, they are pathogenic.

Bacteria are microscopic, single-celled organisms that have a cell wall and a specific shape depending on the type of bacteria. Bacteria have no easily identifiable nucleus. There are many types of bacteria, and although many are harmful to humans there are some that actually help.

Bacteria is a single cell microorganisms ranging from harmless and beneficial to intensely virulent and lethal.

Bacteria (sing. bacterium) are single-celled microorganisms which are prokaryote. We classify them into two strains: aerobic or anaerobic. Some bacteria form spores, but most reproduce through cell di [..]

Single-celled organisms that quickly multiply through cell division. Harmful bacteria called pathogens can cause disease, others can be beneficial to humans, animals and plants.

Are microorganisms. Bacteria of concern are those that are pathogenic and cause infectious diseases. Infections of respiratory pathogenic bacteria could be pneumonia, tuberculosis and cholera.

One of the three domains of life, prokaryotes.

Extremely small (generally from 0.4-10 microns in diameter), single-cell microscopic organisms. They are the most numerous organisms on earth and are formed everywhere, especially in soil. Because the [..]

An organism responsible for infection.

Any of the unicellular prokaryotic microorganisms, which vary in terms of morphology, oxygen and nutritional requirements, and motility, and may be free-living, saprophytic, or pathogenic in organisms.

Single-celled microorganisms that are either free-living or grow on and derive nourishment from dead or decaying organic matter. Some bacteria cause disease in plants and animals.

Bacteria are single-cell microbes that grow in nearly every environment on Earth. They are used to study diseases and produce antibiotics, to ferment foods, to make chemical solvents, and in many other applications.

microscopic organisms that live in soil, water, organic matter, or the bodies of plants and animals. baleen:

in a modern taxonomic system, a domain made up of prokaryotes that usually have a cell wall and that usually reproduce by cell division; this domain aligns with the traditional kingdom Eubacteria

extremely small, single-celled organisms that usually have a cell wall and that usually reproduce by cell division (singular, bacterium)

An organism responsible for infection.

Microscopic organisms that can cause disease.

Microscopic unicellular living organisms.

In the , a taxonomic domain comprising the single kingdom also called Bacteria, containing about 25 phyla. In the(or two-superkingdom system), a taxonomic kingdom, within the Prokaryota: single ce [..]

|Bacteria

bacteria|lang=en ;single bacterium *1864|Dr. Roth|Animalcules in Diseased Blood|The British Journal of Homoeopathy |url=http://books.google.com/books?id=YnCkNrmNGmEC|page=221|volume=XXII|issue=LXXX [..]

Bacteria are single cell micro organisms. Some bacteria cause diseases if they get into the body. 

  Single celled microorganisms that may cause infection.

A single-celled organism. Bacteria are found throughout nature and can be beneficial or harmful.

Bacteria ( ( listen); common noun bacteria, singular bacterium) are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bact [..]

The bacteria are a major group of prokaryotic living organisms. Bacteria may also refer to: Bacteria (malware) or Rabbit Programs, a type of malicious software Bacteria, a fictional country in The Gr [..]

Bacteria ( ( listen); common noun bacteria, singular bacterium) are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bact [..]

Bacteria ( ( listen); common noun bacteria, singular bacterium) are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bact [..]

Bacteria ( ( listen); common noun bacteria, singular bacterium) are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bact [..]

One-celled organisms, not able to be seen except under a microscope, found in rotting matter, in air, in soil and in living bodies, some being the germs of disease

Bacteria are a large group of prokaryotic microorganisms (cells lacking a nucleus, as opposed to eukaryotic ones, that have nucleus, and that form the human body) that were among the first life forms to appear on Earth. They are commonly found in most of the planet’s habitats and live in symbiotic (mutually beneficial), commensal (eating from the s [..]

(Singular bacterium) a microscopic, unicellular (or more rarely multicellular) organism.

Single-celled microorganisms that lack a nucleus.