An effervescing salt containing sodium bicarbonate and Rochelle salt and tartaric acid; used as a cathartic WordNet 3.0 & Open English WordNet

Seidlitz powders is the generic name under which a commonly known laxative and digestion regulator was marketed and sold by numerous manufacturers under names such as "Rexall Seidlitz Powders", particularly in the late 19th and early 20th centuries. Wikipedia

laxative and digestive Wikidata