agonism

noun
ag·​o·​nism | \ ˈa-gə-ˌni-zəm How to pronounce agonism (audio) \

Medical Definition of agonism

: the combining of a chemical substance (such as a drug) with a specific receptor on a cell thereby initiating the same reaction or activity typically produced by the binding of an endogenous substance : the action of an agonist

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a usually brief trip or an expedition

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