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potash alum

[pot-ash al-uhm]

noun

Chemistry.

  1. alum.

potash alum

noun

  1. the full name for alum

“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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Word History and Origins

Origin of potash alum1

First recorded in 1830–40

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