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alum 音标拼音: ['æləm] [əl'ʌm]

n. 明矾

明矾

WordNet (r) 3.0 (2006) (WordNet)

alum
n 1: a white crystalline double sulfate of aluminum: the
ammonium double sulfate of aluminum [synonym: {alum}, {ammonia
alum}, {ammonium alum}]
2: a white crystalline double sulfate of aluminum: the potassium
double sulfate of aluminum [synonym: {alum}, {potassium alum},
{potash alum}]
3: a person who has received a degree from a school (high school
or college or university) [synonym: {alumnus}, {alumna}, {alum},
{graduate}, {grad}]
4: a double sulphate of aluminum and potassium that is used as
an astringent (among other things)

The Collaborative International Dictionary of English v.0.48 (gcide)

Alum \Al"um\, n. [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.
[1913 Webster]

Note: 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 \Al"um\, v. t.
To steep in, or otherwise impregnate with, a solution of
alum; to treat with alum. --Ure.
[1913 Webster]

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英文字典中文字典相关资料:

Alum - Wikipedia
Crystal of potassium alum, KAl(SO 4) 2 ·12H 2 O An alum ( ˈ æ l ə m ) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula X Al(SO 4) 2 ·12 H 2 O, such that X is a monovalent cation such as potassium or ammonium [1] By itself, "alum" often refers to potassium alum, with the
13 Surprising Alum Powder Uses and Benefits - The Good Human
Today, alum is primarily used only as an additive to food, cosmetics, medicine, and more It is a readily available ingredient and a fantastic product And the best part? It has various health benefits and uses and it does not cost much! Read on to find out the top alum powder uses
Alum | Definition, Uses, Formula, Facts | Britannica
alum, any of a group of hydrated double salts, usually consisting of aluminum sulfate, water of hydration, and the sulfate of another element A whole series of hydrated double salts results from the hydration of the sulfate of a singly charged cation (e g , K +) and the sulfate of any one of a number of triply charged cations (e g , Al 3+)

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