antagonist

• Sustantivo que designa a una persona que se opone activamente a alguien o algo, o que le es hostil; también se usa en anatomía para referirse a un músculo que contrarresta la acción de otro, y en farmacología para una sustancia que neutraliza el efecto de otra.

A noun referring to a person who actively opposes or is hostile to someone or something; also used in anatomy for a muscle that opposes the action of another, and in pharmacology for a substance that counteracts the effects of another drug.

1. Opponent or adversaryB2formal

   A person who actively opposes or is hostile to someone or something; an adversary.

   Antagonista, adversario

   • The hero finally defeated his antagonist in the final battle.
   • She was a formidable antagonist in the political debate.
   • The novel's antagonist is a cunning and manipulative character.

   Sinónimosadversarychallengercompetitorcontenderenemyfoehostileopponentopposerrival

   Antónimosadvocateallyfriendproponentsupporter

2. Opposing muscleC1formalmedical

   A muscle that acts in opposition to the action of another muscle, relaxing while the other contracts.

   Músculo antagonista

   • The biceps and triceps are antagonist muscle pairs.
   • When you flex your arm, the antagonist muscle relaxes.
   • Physical therapy often focuses on strengthening antagonist muscles.

   Sinónimosantagonistic muscle

   Antónimosagonistprotagonistsynergist

3. Drug blockerC1formalmedical

   A substance that inhibits or counteracts the physiological action of another substance, such as a hormone or neurotransmitter.

   Antagonista (farmacológico)

   • The doctor prescribed an opioid antagonist to reverse the overdose.
   • This drug acts as a receptor antagonist, blocking the effects of histamine.
   • Antagonist drugs are used to treat various conditions by neutralizing harmful substances.

   Sinónimosblockerblocking agentinhibitor

   Antónimosagonist