/ Dictionary / Index S Seidlitz powders: Meaning and Definition of Find definitions for: Seid'litz pow"ders Pronunciation: (sed'lits), [key] 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. seidel seif Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language