from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various double sulfates of a trivalent metal such as aluminum, chromium, or iron and a univalent metal such as potassium or sodium, especially aluminum potassium sulfate, AlK(SO4)2·12H2O, widely used in industry as clarifiers, hardeners, and purifiers and medicinally as topical astringents and styptics.
- n. Informal An alumna or alumnus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
- n. A graduate of a university or other institution.
from the GNU version of the Collaborative International Dictionary of English
- 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.
- transitive v. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
from The Century Dictionary and Cyclopedia
- n. The general name of a class of double sulphates formed by the union of aluminium, iron, chromium, or manganese sulphate with the sulphate of some other metal, commonly an alkaline metal or ammonium.
- To steep in or impregnate with a solution of alum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
- n. a double sulphate of aluminum and potassium that is used as an astringent (among other things)
- n. a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- n. a person who has received a degree from a school (high school or college or university)
Middle English, from Old French, from Latin alūmen.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Anglo-Norman alum, alume et al., Middle French allume, from Latin alūmen ("alumen"). (Wiktionary)
From alumnus and alumna, by removal of the non-native, gender-specific endings. (Wiktionary)