opiate
1. any of various narcotic drugs, such as morphine and heroin, that act on opioid receptors
2. any other narcotic or sedative drug
3. containing or consisting of opium
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
opiate
[′ō·pē·ət] (pharmacology)
A sleep-inducing drug.
Any narcotic.
An opium preparation.
Any tranquilizing agent.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.