agonist.
Someone involved in a contest or battle (as in an agon), protagonist.
Meaning & usage
Someone involved in a contest or battle (as in an agon), protagonist.
The muscle that contracts while the other relaxes.
When bending the elbow, the biceps is the agonist.
A molecule that can combine with a receptor on a cell to produce a physiological reaction.
Acetylcholine is an agonist at the cholinergic receptor.
Where this word comes from
Borrowed from Latin agōnista, from Ancient Greek ἀγωνιστής (agōnistḗs, “combatant, champion”). By surface analysis, agon or agony + -ist.
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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.