antimony potassium tartrate, K(SbO)CHO·HO, a poisonous, odorless, white salt used in medicine to cause expectoration, vomiting, and perspiration, and in dyeing as a mordant
See tartar emetic in American Heritage Dictionary 4
noun
A poisonous crystalline compound, K(SbO)C4H4O6· 1/2 H2O, used in medicine as an expectorant and in the treatment of parasitic infections, such as schistosomiasis.