alum

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al·um 1

 (ăl′əm)
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 hydrous aluminum potassium sulfate, AlK(SO4)2·12H2O, widely used in industry as clarifiers, hardeners, and purifiers and medicinally as topical astringents and styptics.

[Middle English, from Old French, from Latin alūmen.]

a·lum 2

 (ə-lŭm′)
n. Informal
An alumna or alumnus.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

alum

(ˈæləm)
n
1. (Elements & Compounds) Also called: potash alum a colourless soluble hydrated double sulphate of aluminium and potassium used in the manufacture of mordants and pigments, in dressing leather and sizing paper, and in medicine as a styptic and astringent. Formula: K2SO4.Al2(SO4)3.24H2O
2. (Elements & Compounds) any of a group of isomorphic double sulphates of a monovalent metal or group and a trivalent metal. Formula: X2SO4.Y2(SO4)3.24H2O, where X is monovalent and Y is trivalent
[C14: from Old French, from Latin alūmen]

alum

n
informal chiefly US and Canadian an alumnus or alumna
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

al•um1

(ˈæl əm)

n.
1. a crystalline solid, aluminum potassium sulfate, K2SO4∙Al2(SO4)3∙24H2O, used as an astringent and styptic and in dyeing and tanning.
2. any of a class of analogous double sulfates.
[1275–1325; Middle English < Anglo-French < Latin alūmen]

a•lum2

(əˈlʌm)

n.
an alumna or alumnus.
[by shortening]

alum.

aluminum.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

al·um

(ăl′əm)
Any of various crystalline salts in which a metal such as aluminum or chromium is combined with another metal such as potassium or sodium, especially aluminum potassium sulfate. Alum is widely used in industry as a hardener and purifier, and in medicine to induce vomiting and stop bleeding.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
Al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
double salt - a solution of two simple salts that forms a single substance on crystallization
2.alum - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
Al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
double salt - a solution of two simple salts that forms a single substance on crystallization
3.alum - a person who has received a degree from a school (high school or college or university)alum - a person who has received a degree from a school (high school or college or university)
Ivy Leaguer - a student or graduate at an Ivy League school
old boy - a former male pupil of a school
bookman, scholar, scholarly person, student - a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
4.alum - a double sulphate of aluminum and potassium that is used as an astringent (among other things)
astringent, astringent drug, styptic - a drug that causes contraction of body tissues and canals
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

alum

[ˈæləm] Nalumbre m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

alum

nAlaun m
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

alum

n alumbre m
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in classic literature ?
Sixty or seventy of them, large and small, smooth and shaggy--deer-hound, boar-hound, blood-hound, wolf-hound, mastiff, alaun, talbot, lurcher, terrier, spaniel--snapping, yelling and whining, with score of lolling tongues and waving tails, came surging down the narrow lane which leads from the Twynham kennels to the bank of Avon.
Beyer recognized the role of pore waters in the formation of salt efflorescences and rock crusts, and identified alum salts ("Alaun") as the principal mineral contributing to sandstone deterioration.