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From The Collaborative International Dictionary of English v.0.48 :
Rochelle \Ro*chelle"\, n.
A seaport town in France.
Rochelle powders. Same as Seidlitz powders.
Rochelle salt (Chem.), the double tartrate of sodium and
potassium, a white crystalline substance. It has a
cooling, saline, slightly bitter taste and is employed as
a mild purgative. It was discovered by Seignette, an
apothecary of Rochelle, and is called also Seignete's
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