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 salt.

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