ag·o·nist /ˈægənɪst/
  促效藥; 主動肌
  ag·o·nist /ˈægənəst/ 名詞
  主動肌,顯效藥,促效藥,主縮肌(與拮抗肌對立),顯效劑,促效劑,格鬥者
  Ag·o·nist n.  One who contends for the prize in public games. [R.]
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  agonist
       n 1: the principal character in a work of fiction [syn: protagonist]
       2: someone involved in a contest or battle (as in an agon)
          [ant: adversary]
       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