Meaning of “agonist” in the English Dictionary

"agonist" in English

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agonistnoun [ C ]

/ˈæɡənɪst/ /ˈæɡənɪst/ specialized

agonist noun [ C ] (CHEMICAL)

biology, chemistry a substance that combines with a receptor and causes a change or reaction in the body:

a dopamine agonist
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agonist noun [ C ] (PERSON)

literature, theatre & film a protagonist

(Definition of “agonist” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)