1 One who contends with another, especially in combat; an adversary; an opponent. Antagonist of Heaven’s Almigthy King. Milton. Our antagonists in these controversies. Hooker.
A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.
A medicine which opposes the action of another medicine or of a poison when absorbed into the blood or tissues.
Antagonistic; opposing; counteracting; as, antagonist schools of philosophy.