Source : Webster's Revised Unabridged Dictionary (1913)

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
      salt}.