opioid.
A substance that has effects similar to opium:
Meaning & usage
A substance that has effects similar to opium: Any of the natural substances, such as an endorphin, released in the body in response to pain; an endogenous opioid.
A substance that has effects similar to opium: Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.
Where this word comes from
Attested 1963; from opium + -oid, to distinguish from opiate.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.