Rochelle' salt"

Chem., Pharm.
a colorless or white, water-soluble solid, KNaC4H4O6·4H2O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative. Also called potassium sodium tartrate.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Rochelle powdersroche moutonnée
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