ANTAGONIST

ANTAG'ONIST, noun [Gr. against, and a champion. See Act and Agony.]1. One who contends with another in combat; used primarily in the Grecian games. An adversary.2. An opponent in controversy.3. In anatomy, a muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.ANTAG'ONIST, adjective Counteracting; opposing; combating; as, an antagonist muscle.

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antagonist. Antagonist, n. an opponent, adversary, muscle

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An‐tag″o‐nist (ăn‐tăg″ō̍‐nĭst), n. [[L. antagonista, Gr. ανταγωνιστἤσ; αντἴ against + αγωνιστἤσ combatant, champion, fr. αγωνἴζεσθαι: cf. F. antagoniste. See Antagonism.]] 1. 1. One who contends with another, especially in combat; an adversary; an opponent.
Antagonist of Heaven's Almighty King. Milton. Our antagonists in these controversies. Hooker. 2. 2. (Anat.) A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.
3. 3. (Med.) A medicine which opposes the action of another medicine or of a poison when absorbed into the blood or tissues.
Syn. — Adversary; enemy; opponent; toe; competitor. See Adversary.