antagonist

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an·tag·o·nist / anˈtagənist/ • n. a person who actively opposes or is hostile to someone or something; an adversary: he turned to confront his antagonist. ∎  Biochem. a substance that interferes with or inhibits the physiological action of another.Compare with agonist. ∎  Anat. a muscle whose action counteracts that of another specified muscle. Compare with agonist.

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