A chemical substance that contains aluminum sulfate and a second chemical, usually potassium sulfate. It is used to shrink tissues, to stop bleeding, and to boost the immune response to a vaccine.

A series of double salts of aluminum sulfate and potassium sulfate with the formula Al2(SO4)3·K2SO4·nH2O. Alum is used as a colloidal flocculant in wastewater cleanup.

late 14c., "whitish mineral salt used as an astringent, dye, etc.," from Old French alum, from Latin alumen "alum," literally "bitter salt," cognate with Greek aludoimos [..]

A complex salt, essentially a hydrate of potassium aluminum sulfate, used along with rosin in the SIZING of paper and as a MORDANT for fixing colours. Also called papermaker’s alum.

An acidic substance used in papermaking to adjust the pH level of water in pulp and to fix rosin (a sizing agent first used in the 18th century) to cellulose fibers, giving paper a less permeable surf [..]

Alum seen in a dream, portends frustration of well laid plans. To taste alum, denotes secret remorse over some evil work by you upon some innocent person. For a woman to dream of quantities of alum, foretells disappointment in her marriage and loss of affection.   

A type of immune adjuvant (a substance used to help boost the immune response to a vaccine). Also called aluminum sulfate.

The term used in papermaking for aluminium sulphate. Its action on rosin size is to precipitate the size upon the fibres giving them a degree of water repellency.

(n) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum(n) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum(n) a person who [..]

aluminum sulfate: a chemical, which is mixed into water to cause particles in the water to clump together so they can be removed

A double sulphate of aluminium and potassium.

Also called aluminum sulfate. (1) Chemical release agent, used when pure fiber furnish is run at low basis weight to prevent sticking to the paper machine presses. (2) Papermaking chemical commonly us [..]

technically, a double sulfate of ammonium or a univalent or trivalent metal but commonly used to denote aluminum sulfate (Al2(SO4)3.

originally potassium aluminum sulfate, KAl(SO4)2.12H2O; more recently the term also includes salts in which sodium or ammonium substitute for potassium. [Black, Lavoisier]

An alum is a double salt comprising a sulphate salt of a monovalent element, with the sulphate salt of a trivalent element. The most well known example is potash alum (aluminium potassium sulphate) KA [..]

chemical used in acid hardening fixing baths.

Aluminum sulfate, commonly added during municipal water treatment to cause insoluble colloids to coalesce into larger particles that can be removed by settling. [4]

a substance used in vaccines to help make them more effective

A chemical, aluminum sulfate, added to drinking water to neutralize negative charges on particles so that they will clump together and settle more rapidly; also added to wastewater to remove phosphoru [..]

A very sticky substance added to water during treatment that causes particles in the water to stick together.

Aluminum sulfate. A compound used to flocculate and sink small suspended particulate matter for removal by filtration or vacuuming. Available Chlorine

A common name for aluminium sulphate used as a coagulant in water treatment.

usually in crystal or powder form; has strong astringent properties; used in stypic sticks, popular with men who often nick themselves shaving.

Colorless, water-soluble substance used primarily in astringent and hemostyptic lotions (e.g. after-shave lotion).

n. "alum," s.v. alum OED. KEY: alum@n

n 2 alum 2

<chemistry> A double sulphate formed of aluminium and some other element (especially. An alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization. Common alum is the double sulphate of aluminium and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended [..]

as used in drinking water treatment, aluminum sulfate; added to water in drinking water treatment facilities to cause dirt and other particles to clump together and fall to the bottom of settling basins.

A common name for aluminum sulfate, used as a coagulant.

Chemicals used to 'fix' coloured dyes from plants and animals to a piece of cloth - so it will not wash out or fade over time. This has been found in large amounts on the North Yorkshire coa [..]

 (K2SO4. Al2 (SO4)3.24H2O) potassium aluminium sulfate. ambient air:

Is an aluminum sulfate or filter alum. Acts in the range of 5.0 to 8.0 pH.