The difference between Alum and Alumni
When used as nouns, alum means 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.al2(so4)3.24h2o), whereas alumni means an individual alumnus or alumna.
Alum is also verb with the meaning: to steep in, or otherwise impregnate with, a solution of alum.
check bellow for the other definitions of Alum and Alumni
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Alum as a 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.Al2(SO4)3.24H2O).
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Alum as a noun (chemistry):
Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.
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Alum as a verb (transitive):
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Examples:
"rfquotek Ure"
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Alum as a noun (US):
A graduate of a university or other institution.
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Alumni as a noun:
Examples:
"The alumni of this university include many famous artists and politicians."
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Alumni as a noun (often, _, proscribed):
An individual alumnus or alumna.