agonist

/ˈægʌnɪst/

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Definitions

Noun
the principal character in a work of fiction
Noun
someone involved in a contest or battle (as in an agon)
Noun
a muscle that contracts while another relaxes; "when bending the elbow the biceps are the agonist"
Noun
(biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

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