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Rochelle salt

noun

, Chemistry, Pharmacology.
  1. a colorless or white, water-soluble solid, KNaC 4 H 4 O 6 ⋅4H 2 O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative.


Rochelle salt

noun

  1. a white crystalline double salt, sodium potassium tartrate, used in Seidlitz powder. Formula: KNaC 4 H 4 O 6 .4H 2 O
“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 Rochelle salt1

First recorded in 1745–55; after La Rochelle
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Word History and Origins

Origin of Rochelle salt1

C18: named after La Rochelle , French port
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Example Sentences

It is prepared by heating tartar or "rochelle salt" until no more combustible gas is given off.

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Rochelle powdersroche moutonnée