Alum
Alum Al"um, n. [OE. alum, alom, OF. alum, F. alun, fr. L. alumen alum.] (Chem.) 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. [1913 Webster]

Note: 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 so as to include other double sulphates similar to alum in formula. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Alum — unterscheidet: Alum Branch Alum Cave Branch Alum Cave Creek Alum Cave Run, ein Fluss im US Bundesstaat West Virginia Alum Creek Alum Dirt Branch, ein Fluss im US Bundesstaat Kentucky Alum Fork Alum Fork Saline River, ein Fluss im US Bundesstaat… …   Deutsch Wikipedia

  • alum — ALUM. s. m. Espece de mineral, certain suc condensé qui se trouve dans les mines. Alum de roche. alum de plume. veines, miniere d alum. alum bruslé. eau d alum. laver un livre dans de l eau d alum …   Dictionnaire de l'Académie française

  • Alum — Al um, v. t. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. Ure. [1913 Webster] || …   The Collaborative International Dictionary of English

  • alum — (n.) late 14c., whitish mineral salt used as an astringent, dye, etc., from O.Fr. alum, from L. alumen alum, lit. bitter salt, cognate with Gk. aludoimos bitter and perhaps with English ALE (Cf. ale) …   Etymology dictionary

  • alum — alum1 [al′əm] n. [ME & OFr < L alumen, alum: for IE base see ALE] 1. a double sulfate of a monovalent metal or radical (as sodium, potassium, or ammonium) with a trivalent metal (as aluminum, iron, or chromium): it is used as an astringent, as …   English World dictionary

  • Alum — Alum, Name, so v.w. Alam (s.d.), besonders bei den Großmogulen, so: 1) A. Ghir, so v.w. Aurengzeyb. 2) Schah A. I., Sohn des Vorigen, Großmogul 1707–1711. 3) A. Ghir, Großmogul 1754–1760. 4) Schah A. II., Sohn des Vorigen, Großmogul seit 1759;… …   Pierer's Universal-Lexikon

  • alum — (Ar., Mur.) m. Alumbre …   Enciclopedia Universal

  • alum — ► NOUN ▪ a crystalline compound consisting of a double sulphate of aluminium and potassium, used in dyeing and tanning. ORIGIN Latin alumen …   English terms dictionary

  • Alum — This article is about the chemical compound. For other uses, see Alum (disambiguation). Bulk alum Alum (  / …   Wikipedia

  • alum — alum1 /al euhm/, n. Chem. 1. Also called potash alum, potassium alum. a crystalline solid, aluminum potassium sulfate, K2SO4·Al2(SO4)3·24H2O, used in medicine as an astringent and styptic, in dyeing and tanning, and in many technical processes. 2 …   Universalium

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