va·so·con·stric·tor /-tɚ/
  (a.)血管收縮的血管收縮神經
  va·so·con·stric·tor /ˌvezokənˈstrɪktɚ/ 名詞
  血管收縮的,血管收縮神經,血管收縮藥
  Vas·o·con·strict·or a. Physiol. Causing constriction of the blood vessels; as, the vasoconstrictor nerves, stimulation of which causes constriction of the blood vessels to which they go.  These nerves are also called vasohypertonic.
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  vasoconstrictor
       n : any agent that causes a narrowing of an opening of a blood
           vessel: cold or stress or nicotine or epinephrine or
           norepinephrine or angiotensin or vasopressin or certain
           drugs; maintains or increases blood pressure [syn: vasoconstrictive]