Noun | 1. | chlorpromazine - a drug (trade name Thorazine) derived from phenothiazine that has antipsychotic effects and is used as a sedative and tranquilizer antipsychotic, antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug - tranquilizer used to treat psychotic conditions when a calming effect is desired phenothiazine, thiodiphenylamine - a compound used primarily in veterinary medicine to rid farm animals of internal parasites |