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potash alum

noun, Chemistry.
alum1 (def 1).
Origin of potash alum
1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Historical Examples
  • The rule indicates, also, that aluminium chloride would be better than the sulphate or than potash alum.

    Animal Proteins Hugh Garner Bennett
British Dictionary definitions for potash alum

potash alum

the full name for alum (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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