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Rochelle salt

noun, Chemistry, Pharmacology.
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.
Also called potassium sodium tartrate.
Origin of Rochelle salt
1745-55; after La Rochelle Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rochelle-salt

Rochelle salt

a white crystalline double salt, sodium potassium tartrate, used in Seidlitz powder. Formula: KNaC4H4O6.4H2O
Word Origin
C18: named after La Rochelle, French port
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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rochelle-salt in Medicine

Rochelle salt Ro·chelle salt (rə-shěl', rō-)
See potassium sodium tartrate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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