1
: a potassium aluminum sulfate KAl(SO4)2·12H2O or an ammonium aluminum sulfate NH4Al(SO4)2·12H2O used especially for its astringent and styptic properties
2
: any of various hydrated salts usually consisting of aluminum sulfate with a second cation
3
plural alums
informal
: alumnus, alumna
university students and alums
a Yale alum

alum

3 of 3

abbreviation

Did you know?

Is it acceptable to use alum for alumnus or alumna?

The words that we have used to refer to people who have attended or graduated from a school, college, or university have changed a bit over the past several centuries. Traditionally, the word alumnus has been used to refer to a single male, whereas alumna has been used for a single woman. Initially the plural forms were alumni to refer to multiple men (or multiple men and women) and alumnae for multiple women. A little over a hundred years ago the shortened form of alum began to be used to describe a graduate or past attendee of either gender. Although many people feel that alum is informal, it is in increasing use, and we appear to be moving toward a greater acceptance of the word. The plural of alum is alums.

Examples of alum in a Sentence

Recent Examples on the Web
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Noun
Heartstopper alum Locke confessed to THR that his first read of the script was emotional. — Lily Ford, HollywoodReporter, 7 Oct. 2026 In the doc, SNL alum Tina Fey reflects on how her relationship with Michaels informed her show 30 Rock. — Brianna Zigler, Entertainment Weekly, 2 Oct. 2026 The Dolphins opted to sign none of the four backs who worked out for them on Tuesday -- former Canes standout Damien Martinez, former Titans fourth-rounder Hassan Haskins, Davie University School alum Kenny McIntosh and rookie Elija-Tau Tolliver. — Barry Jackson, Miami Herald, 30 Sep. 2026 Other examples include tie-ups with Barbie star Jamie Demetriou, The Ballad of Wallis Island writer Tom Basden, Ted Lasso alum Nick Mohammed and Cunk on Earth creator Diane Morgan. — Max Goldbart, Deadline, 30 Sep. 2026 See All Example Sentences for alum

Word History

Etymology

Noun (1)

Middle English, from Anglo-French alum, alun, from Latin alumen

Noun (2)

by shortening

First Known Use

Noun (1)

14th century, in the meaning defined at sense 1

Noun (2)

1877, in the meaning defined above

Time Traveler
The first known use of alum was in the 14th century

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Cite this Entry

“Alum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alum. Accessed 10 Oct. 2026.

Kids Definition

alum

noun
al·​um
ˈal-əm
1
: either of two colorless crystalline compounds containing aluminum that are used in medicine (as to check local sweating or to stop bleeding)
2

Medical Definition

1
: either of two colorless or white crystalline double sulfates of aluminum used in medicine internally as emetics and locally as astringents and styptics:
a
: one KAl(SO4)2·12H2O that is a sulfate of aluminum and potassium

called also potassium alum

b
: one consisting of an ammonium aluminum sulfate NH4Al(SO4)2·12H2O

called also ammonia alum, ammonium alum

2
: any of various double salts isomorphous with potassium aluminum sulfate

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