Alum

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) KAl(SO4)2.12H2O which is used to clear murky water.

Alum

[disambiguation] Alum is a species and class of chemical compound. Alum may also refer to: ...
Found on http://en.wikipedia.org/wiki/Alum_(disambiguation)

alum

[n] - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum 2. [n] - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum 3. [n] - a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Found on http://www.webdictionary.co.uk/definition.php?query=alum

Alum

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) KAl(SO4)2.12H2O which is used to clear murky water.
Found on http://www.chemicalglossary.net/definition/104-Alum

Alum

technically, a double sulfate of ammonium or a univalent or trivalent metal but commonly used to denote aluminum sulfate (Al2(SO4)3.
Found on http://www.chemicalglossary.net/definition/14-Alum

Alum

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 coast in the shale type rocks. There are similar chemical compounds based on the substitution of Potassium (K) by Sodium (Na) and Ammonium (NH4).
Found on http://www.encyclo.co.uk/local/20766

Alum

Also called hydrated aluminium sulphate or papermaker's alum. A papermaking chemical that's typically used when adding rosin size to pulp, alum imparts water-resistant properties to paper. In practical terms, it keeps paper from clinging to the presses.
Found on http://www.encyclo.co.uk/local/20829

Alum

Al'um noun [ Middle English alum , alom , Old French alum , French alun , from Latin alumen alum.] (Chemistry) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystal...
Found on http://www.encyclo.co.uk/webster/A/64

Alum

Al'um transitive verb To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. Ure.
Found on http://www.encyclo.co.uk/webster/A/64

alum

<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 exte...
Found on http://www.encyclo.co.uk/local/20973

alum

noun a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Found on http://wordnetweb.princeton.edu/perl/webwn?s=alum

alum

potash alum noun a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
Found on http://wordnetweb.princeton.edu/perl/webwn?s=alum

alum

ammonium alum noun a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
Found on http://wordnetweb.princeton.edu/perl/webwn?s=alum

alum

(al´әm) a local astringent and styptic, prepared as an ammonium (ammonium alum) or potassium (potassium alum) compound; also used as an adjuvant in adsorbed vaccines and toxoids.
Found on http://www.encyclo.co.uk/local/21001

Alum

• (v. t.) To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. • (n.) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.
Found on http://thinkexist.com/dictionary/meaning/alum/

alum

any of a group of hydrated double salts, usually consisting of aluminum sulfate, water of hydration, and the sulfate of another element. A whole ... [5 related articles]
Found on http://www.britannica.com/eb/a-z/a/54

alum

A double salt comprising sulfates of two metals (one monovalent, one trivalent) combined with 12 molecules of water of crystallization: MIMIII(SO4)2.12H2O. The monovalent metal is commo...
Found on http://www.daviddarling.info/encyclopedia/A/alum.html

ALUM

A term commonly, but mistakenly, applied in the paper industry to various qualities of Aluminium Sulphate.
Found on http://www.encyclo.co.uk/local/21179

alum

alum (ăl'um) , any one of a series of isomorphous double salts that are hydrated sulfates of a univalent cation (e.g., potassium, sodium, ammonium, cesium, or thallium) and a trivalent cation (e.g., aluminum, chromium, iron, manganese, cobalt, or titanium). The name alum commonly refers to...
Found on http://www.infoplease.com/ce6/sci/A0803540.html

Alum

Alum is a crystalline, astringent substance with a sweetish taste. It is a double sulphate of potassium and aluminium with water of crystallization. It crystallizes in colourless regular octahedra. Its solution reddens vegetable blues. When heated, its water of crystallization is driven off, and it becomes light and spongy with slightly corrosive p...
Found on http://www.probertencyclopaedia.com/browse/GA.HTM

alum

Type: Term Pronunciation: al′ŭm Definitions: 1. A double sulfate of aluminum and of an alkaline earth element or ammonium; chemically, an alum is any one of the markedly astringent double salts formed by a combination of a sulfate of aluminum, iron, manganese, chromium, or gallium with a sulfate of lithium, sodium, potassium, ammonium, c...
Found on http://www.medilexicon.com/medicaldictionary.php?t=2531

alum

Any double sulphate of a monovalent metal or radical (such as sodium, potassium, or ammonium) and a trivalent metal (such as aluminium, chromium, or iron). The commonest alum is the double sulphate of potassium and aluminium, K2Al2(SO4
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0009897.html

Alum

(chebb) Ground and used in jabane-soft nougat with nuts or almonds. Alum is burnt with hermel, (a fragrant spice) and houd (sandalwood) in a little kanoun (an earthenware brazier) in order to counteract the evil eye.
Found on http://momoresto.com/restaurant/london/momo/cuisine/glossary/

alum

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.
Found on http://www.cancer.gov/dictionary?expand=A

alum

whitish transparent mineral salt, crystalising in octahedrons, very astringent, used in dyeing, tawing skins, and medicine, also for sizing paper, and making materials fireproof; chemically a double sulphate of aluminuim and potasium.
Found on http://www2.shu.ac.uk/sfca/glossary.cfm
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