Definition of alum Alum
/æˈlʌm/ - [atlum] - al•um
We found 11 definitions of alum from 5 different sources.
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What does alum mean?
WordNet
NounPlural: alums |
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| alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum | ||
| ammonia alum, ammonium alum | ||
| aluminium, aluminum, atomic number 13, al a silvery ductile metallic element found primarily in bauxite | ||
| alum - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum | ||
| potassium alum, potash alum | ||
| aluminium, aluminum, atomic number 13, al a silvery ductile metallic element found primarily in bauxite | ||
| alum - a double sulphate of aluminum and potassium that is used as an astringent (among other things) | ||
| alum - a person who has received a degree from a school (high school or college or university) | ||
| alumnus, alumna, graduate, grad | ||
| bookman, scholarly person, student, scholar a learner who is enrolled in an educational institution | ||
| ivy leaguer a student or graduate at an Ivy League school | ||
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Wiktionary 
- alum (Noun)
An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium K2SO4. Al2SO43. 24H2O. - alum (Noun)
A graduate of a university or other institution. - alum (Verb)
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Webster DictionaryWebster's Unabridged Dictionary 📘
- alum (n.)
A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization. - alum (v. t.)
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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alum
al′um, n. a mineral salt, the double sulphate of alumina and potash, used as a mordant in dyeing and for many purposes.—adj. Al′umish, having the character or taste of alum.—ns. Al′um-shale, or -slate, a slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained. [L. alumen.]
Part of speech
🔤- alum, noun, singular of alums.
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