agonist

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noun ag·o·nist \ ˈa-gə-nist \

Definition of agonist

1 :one that is engaged in a struggle
2
[from antagonist]
a :a muscle that is controlled by the action of an antagonist with which it is paired
b :a chemical substance capable of combining with a specific receptor on a cell and initiating the same reaction or activity typically produced by the binding endogenous substance
  • dopaminergic agonists
— compare antagonist 2b

Recent Examples of agonist from the Web

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Origin and Etymology of agonist

Late Latin agonista competitor, from Greek agōnistēs, from agōnizesthai to contend, from agōn


Medical Dictionary

agonist

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noun ag·o·nist \ ˈag-ə-nəst \

medical Definition of agonist

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

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