alum

[ al-uhm ]

/ ˈæl əm /

SEE SYNONYMS FOR alum ON THESAURUS.COM

noun Chemistry.

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.

one of a class of double sulfates analogous to aluminum potassium sulfate, as aluminum ammonium sulfate, having the general formula R2SO4⋅X2(SO4)3⋅24H2O, where R is a univalent alkali metal or ammonium, and X one of a number of trivalent metals.

(not in technical use) aluminum sulfate.

Origin of alum

First recorded in 1275–1325; Middle English <Anglo-French, from Latin alūmen; replacing Old English alefne, ælifnæ, from Old Welsh (compare Medieval Welsh elyf ) <Latin alūmini- (stem of alūmen )

Words nearby alum

altruistic, Altus, ALU, aludel, alula, alum, alumin-, alumina, alumina cement, aluminate, aluminated

Definition for alum (2 of 3)

alum²

[ uh-luhm ]

/ əˈlʌm /

noun Informal.

an alumna or alumnus: Nearly 45 of us alums went on a day trip on the river to celebrate graduation.

Origin of alum

First recorded in 1875–80; by shortening

usage note for alum

See alumnus.

WORDS THAT MAY BE CONFUSED WITH alum

alum , alumna, alumnae, alumni, alumnus

Definition for alum (3 of 3)

alum.

Chemistry.

aluminum.

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for alum

The first-ever Virtual Tech Challenge drew alumni from all 10 reunion classes from 1970 to 2015 as well as some newly minted alums from the Class of 2020.
Virtual Tech Challenge|Tate Ryan-Mosley|August 19, 2020|MIT Technology Review
We’ve helped create over 3,000 jobs to date, and dozens of our alums have started companies, some of which have now raised millions of dollars and generated millions in revenue.
Why Is This Man Running for President? (Ep. 362 Update)|Stephen J. Dubner|December 19, 2019|Freakonomics
Petraeus, himself a Sosh alum, became the central figure for a mix of reasons.
The Petraeus Revolution: How He Changed the American Way of War|John Barry|January 8, 2013|DAILY BEAST
The boys that were charged, let the court system work that out, added Kenny Fazi, another Big Red alum and retired mill worker.
Steubenville Rape Case Splits Town Between Big Red and Guy Fawkes|Winston Ross|January 7, 2013|DAILY BEAST

Broadwell is a smart and able woman, a West Point alum, and, as a major in the Army Reserve, a sometime instructor there.
Early Signs of General Petraeus’s Extramarital Affair|John Barry|November 11, 2012|DAILY BEAST
Runner up is James Fallows of The Atlantic for his hilariously pompous post “As a Harvard Alum, I Apologize.”
Niall Ferguson Defends Newsweek Cover: Correct This, Bloggers|Niall Ferguson|August 21, 2012|DAILY BEAST
The Red Dwarf alum did not initially set out to make a web series.
Jerry Seinfeld’s ‘Comedians in Cars’ Web Series Ruffles U.K. Feathers With Similarity to British ‘Carpool’|Soraya Roberts|August 2, 2012|DAILY BEAST
A curious description is given of the Duke of Buckingham's alum works near Whitby.
In the Name of the Bodleian and Other Essays|Augustine Birrell
The same treated with alum solution yields a medium purple, darker and bluer than that from Brazil.
Intarsia and Marquetry|F. Hamilton Jackson
To avoid this the edges must be moistened with a thin paste to which some alum is added.
The Progress of the Marbling Art|Josef Halfer
They may sometimes be removed by the application of a saturated solution of alum.
The Barnet Book of Photography|Various
Steep in a solution of common salt and alum, and after being made into paper coat with an alcoholic solution of shellac.
Paper and Printing Recipes|J. Sawtelle Ford

British Dictionary definitions for alum

alum

/ (ˈæləm) /

noun

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: K 2 SO 4 .Al 2 (SO 4) 3 .24H 2 O

any of a group of isomorphic double sulphates of a monovalent metal or group and a trivalent metal. Formula: X 2 SO 4 .Y 2 (SO 4) 3 .24H 2 O, where X is monovalent and Y is trivalent

Word Origin for alum

C14: from Old French, from Latin alūmen

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for alum

alum

[ ăl′əm ]

n.

Any of various double sulfates of a trivalent metal such as aluminum or iron and a univalent metal such as potassium or sodium that are used as topical astringents and styptics.

Scientific definitions for alum

alum

[ ăl′əm ]

Any of various crystalline double salts of a trivalent metal (such as aluminum, chromium, or iron) and a monovalent metal (such as potassium or sodium), especially aluminum potassium sulfate. Alum is widely used in industry as a hardener and purifier, and in medicine as an emetic and to stop bleeding.

单词	alum
释义	alum ¹ [ al-uhm ] / ˈæl əm / SEE SYNONYMS FOR alum ON THESAURUS.COM noun Chemistry. 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. one of a class of double sulfates analogous to aluminum potassium sulfate, as aluminum ammonium sulfate, having the general formula R2SO4⋅X2(SO4)3⋅24H2O, where R is a univalent alkali metal or ammonium, and X one of a number of trivalent metals. (not in technical use) aluminum sulfate. Origin of alum ¹ First recorded in 1275–1325; Middle English <Anglo-French, from Latin alūmen; replacing Old English alefne, ælifnæ, from Old Welsh (compare Medieval Welsh elyf ) <Latin alūmini- (stem of alūmen ) Words nearby alum altruistic, Altus, ALU, aludel, alula, alum, alumin-, alumina, alumina cement, aluminate, aluminated Definition for alum (2 of 3) alum² [ uh-luhm ] / əˈlʌm / noun Informal. an alumna or alumnus: Nearly 45 of us alums went on a day trip on the river to celebrate graduation. Origin of alum ² First recorded in 1875–80; by shortening usage note for alum See alumnus. WORDS THAT MAY BE CONFUSED WITH alum alum , alumna, alumnae, alumni, alumnus Definition for alum (3 of 3) alum. Chemistry. aluminum. Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for alum The first-ever Virtual Tech Challenge drew alumni from all 10 reunion classes from 1970 to 2015 as well as some newly minted alums from the Class of 2020. Virtual Tech Challenge\|Tate Ryan-Mosley\|August 19, 2020\|MIT Technology Review We’ve helped create over 3,000 jobs to date, and dozens of our alums have started companies, some of which have now raised millions of dollars and generated millions in revenue. Why Is This Man Running for President? (Ep. 362 Update)\|Stephen J. Dubner\|December 19, 2019\|Freakonomics Petraeus, himself a Sosh alum, became the central figure for a mix of reasons. The Petraeus Revolution: How He Changed the American Way of War\|John Barry\|January 8, 2013\|DAILY BEAST The boys that were charged, let the court system work that out, added Kenny Fazi, another Big Red alum and retired mill worker. Steubenville Rape Case Splits Town Between Big Red and Guy Fawkes\|Winston Ross\|January 7, 2013\|DAILY BEAST Broadwell is a smart and able woman, a West Point alum, and, as a major in the Army Reserve, a sometime instructor there. Early Signs of General Petraeus’s Extramarital Affair\|John Barry\|November 11, 2012\|DAILY BEAST Runner up is James Fallows of The Atlantic for his hilariously pompous post “As a Harvard Alum, I Apologize.” Niall Ferguson Defends Newsweek Cover: Correct This, Bloggers\|Niall Ferguson\|August 21, 2012\|DAILY BEAST The Red Dwarf alum did not initially set out to make a web series. Jerry Seinfeld’s ‘Comedians in Cars’ Web Series Ruffles U.K. Feathers With Similarity to British ‘Carpool’\|Soraya Roberts\|August 2, 2012\|DAILY BEAST A curious description is given of the Duke of Buckingham's alum works near Whitby. In the Name of the Bodleian and Other Essays\|Augustine Birrell The same treated with alum solution yields a medium purple, darker and bluer than that from Brazil. Intarsia and Marquetry\|F. Hamilton Jackson To avoid this the edges must be moistened with a thin paste to which some alum is added. The Progress of the Marbling Art\|Josef Halfer They may sometimes be removed by the application of a saturated solution of alum. The Barnet Book of Photography\|Various Steep in a solution of common salt and alum, and after being made into paper coat with an alcoholic solution of shellac. Paper and Printing Recipes\|J. Sawtelle Ford British Dictionary definitions for alum alum / (ˈæləm) / noun 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: K 2 SO 4 .Al 2 (SO 4) 3 .24H 2 O any of a group of isomorphic double sulphates of a monovalent metal or group and a trivalent metal. Formula: X 2 SO 4 .Y 2 (SO 4) 3 .24H 2 O, where X is monovalent and Y is trivalent Word Origin for alum C14: from Old French, from Latin alūmen Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Words related to alum alumna, recipient, doctor, grad, alumnus, postgraduate, product, bachelor, master, holder, baccalaureate, diplomate, licentiate, collegian Medical definitions for alum alum [ ăl′əm ] n. Any of various double sulfates of a trivalent metal such as aluminum or iron and a univalent metal such as potassium or sodium that are used as topical astringents and styptics. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for alum alum [ ăl′əm ] Any of various crystalline double salts of a trivalent metal (such as aluminum, chromium, or iron) and a monovalent metal (such as potassium or sodium), especially aluminum potassium sulfate. Alum is widely used in industry as a hardener and purifier, and in medicine as an emetic and to stop bleeding. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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alum

noun Chemistry.

Origin of alum

Words nearby alum

Definition for alum (2 of 3)

noun Informal.

Origin of alum

usage note for alum

WORDS THAT MAY BE CONFUSED WITH alum

Definition for alum (3 of 3)

Chemistry.

Example sentences from the Web for alum

British Dictionary definitions for alum

noun

Word Origin for alum

Words related to alum

Medical definitions for alum

n.

Scientific definitions for alum