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.
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| Noun | 1. | 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)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) |
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Translations
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
n → Alaun 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 mEnglish-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.