vas /ˈvæs/
  導管;脈管
  Vas n.; pl. Vasa   Anat. A vessel; a duct.
  Vas deferens; pl. Vasa deferentia.  Anat. The excretory duct of a testicle; a spermatic duct.
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  vas
       n : a tube in which a body fluid circulates [syn: vessel]
       [also: vasa (pl)]