Antagonist meaning

ăn-tăg'ə-nĭst
The definition of an antagonist is a person or thing that competes with or goes against another.

Darth Vader is an example of an antagonist to Luke Skywalker.

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The principal character in opposition to the protagonist or hero of a narrative or drama.
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A person who opposes or competes with another; adversary; opponent.
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One who antagonizes or stirs.
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One who opposes and contends against another; an adversary.
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A drug or chemical substance that interferes with the physiological action of another, especially by combining with and blocking its nerve receptor.
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A muscle that counteracts the action of another muscle, the agonist.
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A muscle that counteracts or opposes the action of another muscle (called the agonist)
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A substance in the body, or a drug, that counteracts or blocks the effect of another substance or drug (called the agonist)
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A muscle that counteracts the action of another muscle, the agonist.
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A drug or chemical substance that interferes with the physiological action of another, especially by combining with and blocking its receptor.
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A muscle that opposes the action of another muscle, as by relaxing while the other one contracts, thereby producing smooth, coordinated movement.
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A chemical substance, such as a drug, that interferes with the physiological action of another substance, especially by combining with and blocking its nerve receptor.
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(biochemistry) A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
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The main character or force opposing the protagonist in a literary work or drama.
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(anatomy) A muscle that acts in opposition to another.

A flexor, which bends a part, is the antagonist of an extensor, which extends it.

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Origin of antagonist

  • From Latin antagonista, from Ancient Greek ἀνταγωνιστής (antagōnistēs, “opponent”) (ἀντί (anti, “against”) + ἀγωνιστής (agōnistēs, “a combatant, pleader, actor”)), from ἀνταγωνίζεσθαι (antagōnizesthai, “antagonize”).
    From Wiktionary