agonist
noun [ C ] specialized uk/ˈæɡənɪst/ us/ˈæɡənɪst/
(MUSCLE)
anatomy 主动肌，主缩肌
a muscle that moves a part of the body by contracting (= becoming shorter)
Compare: antagonist (MUSCLE)
(CHEMICAL)
biology, chemistry 激动剂
a substance that combines with a receptor and causes a change or reaction in the body
a dopamine agonist 多巴胺激动剂
Compare: antagonist (CHEMICAL)
(PERSON)
literature, theatre & film （同 protagonist）
a protagonist