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A seaport town in France. Rochelle powders. Same as seidlitz powders.

(Science: chemistry) Rochelle salt, 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.