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单词 alum
释义

alum

1 of 3

noun (1)

al·​um ˈa-ləm How to pronounce alum (audio)
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 double salts isomorphous with potassium aluminum sulfate
3
: aluminum sulfate

alum

2 of 3

noun (2)

ə-ˈləm How to pronounce alum (audio)
: alumnus, alumna
a Yale alum

alum

3 of 3

abbreviation

aluminum

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.

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

Kids Definition

alum

noun

al·​um ˈa-ləm How to pronounce alum (audio)
: either of two aluminum compounds that are used especially in medicine (as to stop bleeding)

Medical Definition

alum

noun

al·​um ˈal-əm How to pronounce alum (audio)
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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更新时间:2024/12/23 8:59:36