alum - Wiktionary
alum
See also: alúm and ālum
English
Alum (double sulphate of potassium and aluminum)
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Alternative forms
alumn
Etymology 1
From Middle English alum, alum, alym, alyme, from Anglo-Norman alum, alun, from Latinalūmen.
Pronunciation
Noun
alum (countable and uncountable, plural alums)
  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 (K​2​SO​4​·Al​2​(SO​4​)​3​·24H​2​O). [from 14th c.]
    • 1991, Felix Gilbert, The Pope, His Banker, and Venice, page 80,
      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.
    • 2011, Thomas Penn, Winter King, Penguin 2012, p. 201:
      A natural astringent and antiseptic, potassium alum was coveted for its medicinal and cosmetic properties.
  2. (chemistry) 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. [from 17th c.]
    • 1807, William Nicholson (editor), A Journal of Natural Philosophy, Chemistry, and the Arts, Volume XVIII, page 286,
      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.
    • 2000 June, Competition Science Vision, page 486,
      For similar reasons, aluminium sulphate and alums are used in dyeing cloth. […] Normally alums are soluble in water and insoluble in alcohols.
    • 2005, Amit Arora, Text Book Of Inorganic Chemistry, page 386,
      In structure, the alums consist of simple ions, being not complexes, but double salts. Potash alum or potassium alum is the common alum, with the formula KAl(SO4)2·12H2O) which, for convenience, may be written K​2​SO​4​·Al​2​(SO​4​)​3​·24H​2​O
Synonyms
(double sulphate of potassium and aluminum):potash alum
Derived terms
term derived from alum
Related terms
Translations
chemistry: double sulfate
See also
Verb
alum (third-person singular simple presentalums, present participle aluming, simple past and past participle alumed)
(transitive) To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
1839, Andrew Ure, A Dictionary of Arts, Manufactures, and Mines
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
Derived terms
unalumed
Translations
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Spanish: alumbrar (es)
Etymology 2
From alumnus and alumna (> alumn- > alum), by the removal of the originally Latin gender-specific​nominative singular case endings -us (masculine) and -a (feminine).
Pronunciation
Noun
alum (plural alums)
(shortening, Canada, US) A past attendee or graduate (of either gender) of a college, university or other educational institution.
  • 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.
  • 2006, Ted Hart, James M. Greenfield, Pamela M. Gignac, Christopher Carnie, Major Donors: Finding Big Gifts in Your Database and Online, page 47,
    You'll remember that we're starting with a list of slightly over 7,000 names that are alums (most of them over 50) that we'd like to whittle down to a manageable list of prospects.
  • 2009, Timothy C. Jacobson, Charity & Merit: Trinity School at 300, page 190,
    All schools that last have alums, and, ancient as it was by American standards, Trinity by mid-century had thousands.
Synonyms
(of any gender): alumni (often proscribed), alumnx
Hyponyms
(the original Latin gender-specific loanwords): alumna (feminine), alumnus (of unspecified gender or masculine)
Anagrams
Lamu, luma, malu, maul, mula
Latin
Etymology
From Proto-Italic *ālom, from Proto-Indo-European *h₂eHlu (“esculent root”), uncertainly reconstructed. Related to Sanskrit आलु (ālu, “esculent root”), whence Hindi आलु (ālu, “potato, yam”), and the culinary borrowing, English aloo(“potato”), Latin allium (“garlic”).
Pronunciation
Noun
ālum n (genitive ālī); second declension
A plant, the comfrey
Declension
Second-declension noun (neuter).
CaseSingularPlural
Nominativeālumāla
Genitiveālīālōrum
Dativeālōālīs
Accusativeālumāla
Ablativeālōālīs
Vocativeālumāla
References
Latvian
Noun
alum m
dative singular form of alus
Middle English
Noun
alum
Alternative form of alym
Old French
Alternative forms
allum, alun
Etymology
From Latin alūmen.
Noun
alum m (oblique plural aluns, nominative singular aluns, nominative plural alum)
alum
Descendants
References
alum on the Anglo-Norman On-Line Hub
Last edited on 16 July 2021, at 09:51
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