alum

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al·um 1

 (ăl′əm)
n.
Any of various double sulfates of a trivalent metal such as aluminum, chromium, or iron and a univalent metal such as potassium or sodium, especially hydrous aluminum potassium sulfate, AlK(SO4)2·12H2O, widely used in industry as clarifiers, hardeners, and purifiers and medicinally as topical astringents and styptics.

[Middle English, from Old French, from Latin alūmen.]

a·lum 2

 (ə-lŭm′)
n. Informal
An alumna or alumnus.

alum

(ˈæləm)
n
1. (Elements & Compounds) Also called: potash alum a colourless soluble hydrated double sulphate of aluminium and potassium used in the manufacture of mordants and pigments, in dressing leather and sizing paper, and in medicine as a styptic and astringent. Formula: K2SO4.Al2(SO4)3.24H2O
2. (Elements & Compounds) any of a group of isomorphic double sulphates of a monovalent metal or group and a trivalent metal. Formula: X2SO4.Y2(SO4)3.24H2O, where X is monovalent and Y is trivalent
[C14: from Old French, from Latin alūmen]

alum

n
informal chiefly US and Canadian an alumnus or alumna

al•um1

(ˈæl əm)

n.
1. a crystalline solid, aluminum potassium sulfate, K2SO4∙Al2(SO4)3∙24H2O, used as an astringent and styptic and in dyeing and tanning.
2. any of a class of analogous double sulfates.
[1275–1325; Middle English < Anglo-French < Latin alūmen]

a•lum2

(əˈlʌm)

n.
an alumna or alumnus.
[by shortening]

alum.

aluminum.

al·um

(ăl′əm)
Any of various crystalline salts in which a metal such as aluminum or chromium is combined with another metal such as potassium or sodium, especially aluminum potassium sulfate. Alum is widely used in industry as a hardener and purifier, and in medicine to induce vomiting and stop bleeding.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
Al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
double salt - a solution of two simple salts that forms a single substance on crystallization
2.alum - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
Al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
double salt - a solution of two simple salts that forms a single substance on crystallization
3.alum - a person who has received a degree from a school (high school or college or university)alum - a person who has received a degree from a school (high school or college or university)
Ivy Leaguer - a student or graduate at an Ivy League school
old boy - a former male pupil of a school
bookman, scholar, scholarly person, student - a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
4.alum - a double sulphate of aluminum and potassium that is used as an astringent (among other things)
astringent, astringent drug, styptic - a drug that causes contraction of body tissues and canals
Translations

alum

[ˈæləm] Nalumbre m

alum

nAlaun m

alum

n alumbre m
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