Noun: antagonist an'ta-gu-nist
- Someone who offers opposition
"The two candidates viewed each other as worthy antagonists in the debate";
- adversary, opponent, opposer, resister
- A muscle that relaxes while another contracts
"when bending the elbow the triceps are the antagonist"
- A drug that neutralizes or counteracts the effects of another drug
"The doctor administered an opioid antagonist to reverse the effects of the overdose"
Derived forms: antagonists
Type of: actor, antagonistic muscle, doer, drug, worker
Encyclopedia: Antagonist