opioid
adjectiveDefinition of opioid
(Entry 1 of 2)
1
: possessing some properties characteristic of opiate narcotics but not derived from opium
2
: of, involving, or induced by an opioid
opioid
nounDefinition of opioid (Entry 2 of 2)
1
: any of a group of endogenous neural polypeptides (such as an endorphin or enkephalin) that bind especially to opiate receptors and mimic some of the pharmacological properties of opiates
— called also opioid peptide
2
: a synthetic drug possessing narcotic properties similar to opiates but not derived from opium
broadly
: opiate sense 1a
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