What is "antimony potassium tartrate"

n. a poisonous colorless salt used as a mordant and in medicine [syn: tartar emetic]

Antimony potassium tartrate, also known as potassium antimonyl tartrate, potassium antimontarterate, or emetic tartar, has the formula KSb(CHO) and is the double salt of potassium and antimony of tartaric acid. The compound has long been known as a powerful emetic, and was used in the treatment of schistosomiasis and leishmaniasis.