opiate

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various sedative narcotics containing opium or one or more of its natural or synthetic derivatives.
2. n. A drug, hormone, or other chemical substance having sedative or narcotic effects similar to those containing opium or its derivatives: a natural brain opiate. Also called opioid.
3. n. Something that dulls the senses and induces relaxation or torpor.
4. adj. Containing opium or any of its derivatives.
5. adj. Resembling opium or its derivatives in activity.
6. adj. Inducing sleep or sedation; soporific.
7. adj. Causing dullness or apathy; deadening.
8. v. To subject to the action of an opiate.
9. v. To dull or deaden as if with a narcotic drug.

Century Dictionary and Cyclopedia

1. Furnished with opium; mixed or prepared with opium; hence, inducing sleep; soporiferous; somniferous; narcotic; causing rest or inaction.
2. n. Any medicine that contains opium and has the quality of inducing sleep or repose; a narcotic; hence, anything which induces rest or inaction, or relieves uneasiness or irritation, mental or bodily; anything that dulls sensation, mental or physical.
3. To lull to sleep; ply with opiates.
4. To dull the effect of upon the mind, as by an opiate.

Wiktionary

1. adj. Relating to, resembling, or containing opium.
2. adj. Soporific; inducing sleep or sedation.
3. adj. Deadening; causing apathy or dullness.
4. n. A drug, hormone or other substance derived from or related to opium.
5. n. Something that dulls the senses and induces a false and unrealistic sense of contentment.
6. v. transitive To treat with an opiate drug.

GNU Webster's 1913

1. n. Originally, a medicine of a thicker consistency than sirup, prepared with opium.
2. n. Any medicine that contains opium, and has the quality of inducing sleep or repose; a narcotic.
3. n. Anything which induces rest or inaction; that which quiets uneasiness.
4. adj. Inducing sleep; somniferous; narcotic; hence, anodyne; causing rest, dullness, or inaction.
5. v. rare To subject to the influence of an opiate; to put to sleep.

WordNet 3.0

1. n. a narcotic drug that contains opium or an opium derivative