Word Study
altruistic |
altruistically |
aludel |
alula |
alular |
alum
| alum root
| alum schist
| alum shale
| alum stone
| alumbloom
alum
WORDNET DICTIONARY
Noun alum has 4 senses
- alum(n = noun.substance) ammonia alum, ammonium alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum; Array is a kind of al, aluminium, aluminum, atomic number 13, double salt
- alum(n = noun.substance) potash alum, potassium alum - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum; Array is a kind of al, aluminium, aluminum, atomic number 13, double salt
- alum(n = noun.person) alumna, alumnus, grad, graduate - a person who has received a degree from a school (high school or college or university); Array has particulars: ivy leaguer, old boy
- alum(n = noun.artifact) Array - a double sulphate of aluminum and potassium that is used as an astringent (among other things); Array is a kind of astringent, astringent drug, styptic
is a kind of bookman, scholar, scholarly person, student
CIDE DICTIONARY
alum, n. [OE. alum, alom, OF. alum, F. alun, fr. L. alumen alum.].
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. [1913 Webster]
" 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."
[1913 Webster]
alum, v. t.
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. Ure. [1913 Webster]
OXFORD DICTIONARY
alum, n.
1 a double sulphate of aluminium and potassium.
2 any of a group of compounds of double sulphates of a monovalent metal (or group) and a trivalent metal.
1 a double sulphate of aluminium and potassium.
2 any of a group of compounds of double sulphates of a monovalent metal (or group) and a trivalent metal.
Etymology
ME f. OF f. L alumen aluminis
ROGET THESAURUS
alum
Sourness
N sourness, acid, acidity, low pH, acetous fermentation, lactic fermentation, vinegar, verjuice, crab, alum, acetic acid, lactic acid, sour, acid, acidulous, acidulated, tart, crabbed, acetous, acetose, acerb, acetic, sour as vinegar, sourish, acescent, subacid, styptic, hard, rough, sour as a lemon, (4) Odor.
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