ANTAGONIST

Definition:

1. [noun] someone who offers opposition
   Synonyms: adversary, opponent, opposer, resister
   
   
2. [noun] a muscle that relaxes while another contracts; "when bending the elbow the triceps are the antagonist"
   
   
3. [noun] a drug that neutralizes or counteracts the effects of another drug
   
   

Synonyms:

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Related Words:

• dueler, dueller, duelist, duellist
• enemy, foe, foeman, opposition
• Luddite
• withstander
• Antichrist
• estrogen antagonist, tamoxifen
• narcotic antagonist