The American Heritage® Dictionary of the English Language, 4th Edition
n. A crystalline compound, C21H26ClN3OS, used as a tranquilizer especially in the treatment of psychosis and to prevent or alleviate nausea and vomiting.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults
Word Usage
"In the past two months, my psychiatrist has tried to wean me away from perphenazine, an anti-psychotic medication that can lead to tardive dyskinesia, an involuntary movement of the facial muscles."