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