Rochelle salt

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po·tas·si·um so·di·um tar·trate

a mild saline cathartic, used as an ingredient in compound effervescent powders.

Rochelle salt

or

Rochelle salts

(rə-shĕl′, rō-)
n.
See potassium sodium tartrate.

Rochelle salt

Potassium sodium tartrate, a colorless, transparent powder having a cooling and saline taste and formerly used as a saline cathartic.
See also: salt