agonist
UK /ˈæ.ɡɘ.nɪst/ US /ˈæ.ɡɘ.nɪst/
noun 3
Definitions
noun
1
Someone involved in a contest or battle (as in an agon), protagonist.
2
The muscle that contracts while the other relaxes.
When bending the elbow, the biceps is the agonist.
3
A molecule that can combine with a receptor on a cell to produce a physiological reaction.
Acetylcholine is an agonist at the cholinergic receptor.
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