agonist

Noun
  1. The principal character in a work of fiction (synset 110192465)
    is a type of: character, fictional character, fictitious character - an imaginary person represented in a work of fiction (play or film or story)
    subtypes: antihero - a protagonist who lacks the characteristics that would make him a hero (or her a heroine)
    same as: protagonist
  2. Someone involved in a contest or battle (as in an agon) (synset 109798721)
    is a type of: contestant - a person who participates in competitions
  3. A muscle that contracts while another relaxes (synset 105300767)
    "when bending the elbow the biceps are the agonist"
    is a type of: antagonistic muscle - (physiology) a muscle that opposes the action of another
  4. (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction (synset 102687648)
    referred to in: biochemistry - the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
    is a type of: drug - a substance that is used as a medicine or narcotic

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