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WordNet-Online
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Noun antagonist has 3 senses
- adversary, antagonist, opponent, opposer, resister - someone who offers opposition
--1 is a kind of person, individual, someone, somebody, mortal, human, soul
Antonyms: agonist
--1 has particulars:
- antagonist - a muscle that relaxes while another contracts; "when bending the elbow the triceps are the antagonist"
--2 is a kind of antagonistic muscle
- antagonist - a drug that neutralizes or counteracts the effects of another drug
--3 is a kind of drug
Antonyms: synergist
--3 has particulars: estrogen antagonist, tamoxifen; narcotic antagonist
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