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Noun, pl. agonists

1. An agonist is a chemical that binds to some receptor of a cell and triggers a response by that cell. Agonists often mimic the action of a naturally occurring substance. (

2. (Pharmacology)
A molecule that combines with a receptor on a cell to trigger physiological reaction. An example is an acetylcholine being the agonist that combines with the cholinergic receptor. (

3. (Histology)
A muscle that contracts while another muscle relaxes, e.g. when bending the elbow the biceps are the agonist. (

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