Antagonist
/æˈntæɡənəst/
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Definition
(noun) An opponent or enemy.
Sentence Examples
Caffeine is a purinergic antagonist that competitively inhibits adenosine at the sites of P1 receptors.
The antagonist of the book was introduced on the second page.
CEFR Practice Quiz
The main ____ in the story was a powerful and evil wizard from afar.