A minute living organism, such as a bacterium, fungus, yeast, virus or rickettsia.

Single-celled living organisms that can be seen only with the aid of a microscope. microparasite

Microorganisms are living organisms that are too small to be seen individually by the naked eye (they are usually viewed with microscopes.) They include bacteria, viruses, protozoa and some fungi and [..]

Living organisms that are so small that they cannot be seen without the aid of a microscope.

  Generic term for any microscopic plants or animals, an understanding of the  existence and actions of which -- particularly bacteria -- were major scientific  achievements during the nineteenth cent [..]

Small organisms, such as bacteria and other minute entities, invisible to the unaided eye.

Bacteria, yeasts, simple fungi, algae, protozoans, and a number of other organisms that are microscopic in size. Most are beneficial but some produce disease. Others are involved in composting and sew [..]

Independent organisms of microscopic size, including bacteria, yeast and mold. When alive in a suitable environment, they grow rapidly and may divide or reproduce every 10 to 30 minutes. Therefore, th [..]

Plant or animal life so small that it can only be seen through a microscope such as bacteria, yeasts, algae, and protozoa. Some microorganisms are beneficial while others pose risks to human health.

These are microscopic living organisms, which may be single or multicellular. They are very diverse and include all the bacteria and archaea, and almost all the protozoa. Microorganisms also include some fungi, algae and certain animals, such as rotifers. Some microbiologists also classify viruses (and viroids) as microorganisms. Microorganisms liv [..]

Often wrongly used as a synonym of the word “microbe”, microorganisms are single- or multiple-cell organisms, so tiny that they cannot be seen with the naked eye (microscopic). Microorganisms are diverse and include parasites, bacteria, archaea, fungi and viruses. Microorganisms are the oldest form of life on Earth. The study of microorganisms is c [..]

a plant or animal visible only with microscopic magnification.

Microscopic living organisms that digest organic material through metabolic activity.

Microscopic organisms such as bacteria and viruses, commonly known as germs, can cause infections in humans.

Living organisms that can be seen individually only with the aid of a microscope.

Bacteria, virus, or parasite that cannot be seen without a microscope. Some are harmful and can cause disease, infection or illness.

Any minute living organism including bacteria, yeasts, moulds, viruses, protozoa and prions

Microscopically small living things that digest organic material through metabolic activity.

Very small organisms; so small that you need to use a microscope to see them.

Most specifically, these are organisms that are microscopic in size. In the air and water purification industry this term generally refers to harmful or disease causing biological organisms.

Minute organisms, such as bacteria, that are not visible or barely visible to the unaided eye.

organisms too small to be seen with the unaided eye, including bacteria, protozoans, yeasts, viruses, and algae.

Bacteria, yeasts, simple fungi, algae, protozoans, and a number of other organisms that are microscopic in size. Most are beneficial but some produce disease. Others are involved in composting and sew [..]

Microscopic organisms including bacteria, protozoans, yeast, fungi, mold, viruses, and algae.

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