agonist

nouns

the principal character in a work of fiction
is derived from
someone involved in a contest or battle (as in an agon)
is derived from
is derived from
is derived from
antonym
is a type of (narrower)
a person who participates in competitions
a muscle that contracts while another relaxes
"when bending the elbow the biceps are the agonist"
is a type of (narrower)
(physiology) a muscle that opposes the action of another
"the biceps and triceps are antagonistic muscles"
(biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
domain category
the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
is a type of (narrower)
a substance that is used as a medicine or narcotic