Alum
WordNet
noun
(1) A double sulphate of aluminum and potassium that is used as an astringent (among other things)
(2) A person who has received a degree from a school (high school or college or university)
(3) A white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
(4) A white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
WiktionaryText
Noun
- the double sulphate of potassium and aluminium with chemical formula K2SO4.Al2(SO4)3.24H2O.
- 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.
Related terms
- aluminiferous, aluniferous
- aluminiform
- aluminilite
- aluminise, aluminize
- aluminite
- aluminous
- alunite
- alunogen
Etymology 2
From alumnus and alumna, by removal of the non-native, gender-specific endings.
See also
- apjohnite
- bosjemanite
- halotrichite
- kalinite
- websterite
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Noun
alum - singular dative form of alus
- beer (base form (en))