a synthetic drug, CHClNS, used to treat certain mental disorders and to control nausea and vomiting
See chlorpromazine in American Heritage Dictionary 4
(klôr-prŏmˈə-zēnˌ, -prōˈmə-, klōr-)
noun
A drug, C17H19ClN2S, derived from phenothiazine and used to suppress vomiting and as a sedative and a tranquilizer, especially in the treatment of schizophrenia and other psychotic states.