alum - WordReference.com Dictionary of English

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- - alto
  - alto clef
  - alto-relievo
  - altocumulus
  - altogether
  - altostratus
  - altricial
  - altruism
  - ALU
  - alula
  - alum
  - alumina
  - aluminium
  - aluminium bronze
  - aluminosilicate
  - alumnus
  - alveolar
  - alveolitis
  - alveolus
  - alway
  - always
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alum

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Concise Oxford English Dictionary © 2008 Oxford University Press:
alum /ˈaləm/

▶noun Chemistry

1 (also potash alum) a colourless astringent compound which is a hydrated double sulphate of aluminium and potassium, used in solution in dyeing and tanning.

2 any of a series of analogous compounds of other metals.

– origin ME: via OFr. from L. alumen, alumin-, rel. to aluta ‘tawed leather’.

'alum' also found in these Oxford entries:

alumina - taw - whitleather

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