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Antagonist

Definition: One who contends with another, especially in combat; an
adversary; an opponent.

Antagonist

Definition: A muscle which acts in opposition to another; as a
flexor, which bends a part, is the antagonist of an extensor, which
extends it.

Antagonist

Definition: A medicine which opposes the action of another medicine
or of a poison when absorbed into the blood or tissues.

Antagonist

Definition: Antagonistic; opposing; counteracting; as, antagonist
schools of philosophy.