■ noun
1》 a person who actively opposes or is hostile towards someone or something.
2》 Biochemistry a substance which interferes with the physiological action of another.
3》 Anatomy a muscle whose action counteracts that of another muscle.
Derivatives
~ic adjective
~ically adverb
Origin
C16: from Fr. ~e or late L. ~a , from Gk antagōnistēs , from antagōnizesthai (see antagonize ); cf. agonist .