Rochelle salt[rō s̸hel′]
a colorless crystalline compound, potassium sodium tartrate, KNaCHO·4HO, used as a laxative, in baking powders, and, in electronics, as a piezoelectric material
Origin of Rochelle saltafter La Rochelle, France, where discovered
or Ro·chelle salts
Origin of Rochelle saltAfter (La) Rochelle.
(plural Rochelle salts)
From La Rochelle in France