excitant

名词 excitant:

1. a drug that temporarily quickens some vital process
   同义词：stimulant, stimulant drug

形容词 excitant:

1. (of drugs e.g.) able to excite or stimulate
   同义词：excitative, excitatory

ex.ci.tant

adj.（形容词）
Tending to excite; stimulating.
使兴奋的：趋向兴奋的；使兴奋的
n.（名词）
An agent or stimulus that excites; a stimulant.
兴奋剂：使人兴奋的东西；兴奋剂