de·pres·sant /dɪˈprɛsṇt, di-/
  (a.)抑制的,鎮靜的抑製藥,鎮靜藥
  de·pres·sant /-ṇt/ 形容詞
  鎮靜劑抑制劑
  De·press·ant n. Med. An agent or remedy which lowers the vital powers.
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  depressant
       adj : capable of depressing physiological or psychological
             activity or response by a chemical agent [ant: stimulative]
       n : a drug that reduces excitability and calms a person [syn: sedative,
            sedative drug, downer]