agonist

/ˈæɡənɪst/ · 3 syllables

Meaning

noun

1. the principal character in a work of fiction
2. someone involved in a contest or battle (as in an agon)
3. a muscle that contracts while another relaxes
   “when bending the elbow the biceps are the agonist”
4. (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

Synonyms for agonist

• protagonist

Antonyms of agonist

• antagonist