alum

名词 n. 动词 v.
中文释义

英文释义

名词 n.
  1. An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O). countable,uncountable
    — Venice also needed alum for trade, since it was the point of departure for overland transportation of alum to southern Germany and its cloth-manufacturing Free Cities.
  2. A past attendee or graduate (of any gender) of a college, university or other educational institution. Canada,US
    — 1961 Spring, Anchora of Delta Gamma, Volume LXXVII, No. 3, page 59, Evanston-North Shore alums are happy to open their homes to Sigma actives for special social events.
  3. 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. countable,uncountable
    — With weld and cochineal, which are colouring matters the most sensible to the action of sulphate of iron, the purified alums gave us colours more brilliant, fresh, and in a slight degree lighter; while those with our common alums were all duller, and evidently of a deeper hue.
动词 v.
  1. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. transitive
    — The silk should be boiled at the rate of 20 parts of soap per cent. , and then alumed. The aluming need not be so strong as for the fine crimson

词形变化

alums plural alumn alternative alums present,singular,third-person aluming participle,present alumed participle,past alumed past alumn alternative alums plural alumni plural alumn alternative

词汇关系

近义词
potash alum
衍生词
alum-basket alum cake alum earth alumed alumiferous alumina aluming alumish alumium alum mine alumocalcite alum rock alum root alumroot alum schist alum shale alum slate alumstone alum stone alum works ammonia alum burnt alum cake alum carmalum chrome alum chrome-ammonia alum common alum feather alum filter alum hemalum iron alum magnesia alum manganese alum manganoso-magnesium alum native alum papermaker's alum plume alum plumose alum potash alum pseudo alum rock alum Roman alum saccharine alum silver alum soda alum sodium alum unalumed
相关词
aluminiferous aluniferous aluminiform aluminilite aluminise aluminize aluminite aluminous alunite alunogen apjohnite bosjemanite halotrichite kalinite websterite

词源

词源 1
From Middle English alum, alum, alym, alyme, from Anglo-Norman alum, alun, from Latin alūmen.
词源 2
Clipping of alumnus and alumna (> alumn- > alum), by the removal of the originally Latin gender-specific nominative singular case endings -us (masculine) and -a (feminine).
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