Definition of 'agonist'
- the principal character in a work of fiction
- someone involved in a contest or battle (as in an agon)
Antonyms: adversary antagonist opponent opposer resister
- a muscle that contracts while another relaxes; "when bending the elbow the biceps are the agonist"
- (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction