I. ˈō-pē-ət, -ˌāt noun
Date: 15th century
1.
a. : a drug (as morphine or codeine) containing or derived from opium and tending to induce sleep and alleviate pain ; broadly : narocotic 1a
b. : opioid 1
2. : something that induces rest or inaction or quiets uneasiness
II. adjective
Date: 1543
1.
a. : containing or mixed with opium
b. : of, relating to, binding, or being an opiate
opiate receptors
2.
a. : inducing sleep : narcotic
b. : causing dullness or inaction