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Webster 1913 Edition
Vas
‖
Vas
,Noun.
pl. 
Vasa 
(#)
. [L., a vessel. See 
Vase
.] (Anat.) 
A vessel; a duct. 
‖
Vas deferens
; 
pl. 
Vasa deferentia
. [L. 
vas 
vessel + deferens 
carrying down.] (Anat.) 
The excretory duct of a testicle; a spermatic duct.