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Webster 1913 Edition
Alum
Al′um
,Noun.
[OE.
alum
, alom
, OF. alum
, F. alun
, fr. L. alumen
alum.] (Chem.)
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.
☞ Common alum is the double sulphate of aluminium and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended so as to include other double sulphates similar to alum in formula.
Al′um
,Verb.
T.
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Ure.
Webster 1828 Edition
Alum
AL'UM
,Noun.
A triple sulphate of alumina and potassa. This substance is white, transparent and very astringent; but seldom found pure or crystallized. This salt is usually prepared by roasting and lixiviating certain clays containing pyrites, and to the lye adding a certain quantity of potassa; the salt is then obtained by crystallization. Alum is of great use in medicine and the arts. In medicine, it is used as an astringent; internally, in hemoptoe, diarrhea, and dysentery; externally, as a styptic applied to bleeding vessels, and as an escharotic. In the arts, it is used in dyeing to fix colors; in making candles, for hardening the tallow; in tanning, for restoring the cohesion of skins.
Definition 2024
alúm
alúm
See also: alum
Irish
Noun
alúm m (genitive singular alúim, nominative plural alúim)
Declension
Declension of alúm
First declension
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Bare forms:
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Forms with the definite article:
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Synonyms
Mutation
| Irish mutation | |||
|---|---|---|---|
| Radical | Eclipsis | with h-prothesis | with t-prothesis |
| alúm | n-alúm | halúm | unchanged |
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs. | |||
References
- "alúm" in Foclóir Gaeilge-Béarla, An Gúm, 1977, by Niall Ó Dónaill.