opioid: Meaning and Definition of
Pronunciation: (ō'pē-oid"), [key]
— n. Biochem, Pharm.
- any opiumlike substance.
- any of a group of natural substances, as the endorphins, produced by the body in increased amounts in response to stress and pain.
- any of several synthetic compounds, as methadone, having effects similar to natural opium alkaloids and their derivatives.
- pertaining to such a substance.