agonist

2 entries found for agonist.
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agonist prime mover

Main Entry: ag·o·nist
Pronunciation: ag--nst
Function: noun
1 : a muscle that on contracting is automatically checked and controlled by the opposing simultaneous contraction of another muscle -- called also agonist muscle, prime mover -- compare ANTAGONIST a, SYNERGIST 2
2 : a chemical substance (as a drug) capable of combining with a receptor on a cell and initiating the same reaction or activity typically produced by the binding of an endogenous substance <binding of adrenergic agonists> -- compare ANTAGONIST b