ex·ci·tant /ɪkˈsaɪtṇt, ˈɛksətənt/
  (a.)刺激性的,使興奮的刺激物,興奮劑
  ex·ci·tant /ɪkˈsaɪtṇt, ˈɛksətənt/ 形容詞
  興奮劑,剌激物
  Ex·cit·ant a.  Tending to excite; exciting.
  Ex·cit·ant, n. Physiol. An agent or influence which arouses vital activity, or produces increased action, in a living organism or in any of its tissues or parts; a stimulant.
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  excitant
       adj : (of drugs e.g.) able to excite or stimulate [syn: excitative,
              excitatory]