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Meaning of Seidlitz powders

Seid'litz pow"ders

Pronunciation: (sed'lits), [key]
  1. a mild laxative consisting of tartaric acid, sodium bicarbonate, and Rochelle salt, which are dissolved separately, mixed, and drunk after effervescence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.