agonist

Definitions of agonist
1

n someone involved in a contest or battle (as in an agon)

Antonyms:
adversary, antagonist, opponent, opposer, resister
someone who offers opposition
Type of:
contestant
a person who participates in competitions

n the principal character in a work of fiction

Synonyms:
protagonist
Example of:
character, fictional character, fictitious character
an imaginary person represented in a work of fiction (play or film or story)
Types:
antihero
a protagonist who lacks the characteristics that would make him a hero (or her a heroine)

n a muscle that contracts while another relaxes

“when bending the elbow the biceps are the agonist
Type of:
antagonistic muscle
(physiology) a muscle that opposes the action of another

n (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

Type of:
drug
a substance that is used as a medicine or narcotic

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