The Collaborative International Dictionary of English v.0.48:

chlorpromazine \chlorpromazine\ n.
   a drug derived from phenothiazine and used as a sedative and
   tranquilizer.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

chlorpromazine
    n 1: a drug (trade name Thorazine) derived from phenothiazine
         that has antipsychotic effects and is used as a sedative
         and tranquilizer [syn: chlorpromazine, Thorazine]