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Webster 1913 Edition

Adj.

Antagonistic; opposing; counteracting;

as,

antagonist

schools of philosophy

Noun.

[Gr. against, and a champion. See Act and Agony.]

One who contends with another in combat; used primarily in the Grecian games. An adversary.

An opponent in controversy.

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.

Adj.

Counteracting; opposing; combating; as, an antagonist muscle.