vas def·er·ens 
(dĕfər-ənz, -ə-rĕnz′)
(dĕfər-ənz, -ə-rĕnz′)n. pl. vasa def·er·en·ti·a (dĕf′ə-rĕnshē-ə)
A duct through which semen is carried from the epididymis of each testicle to an ejaculatory duct.
[New Latin vās dēferēns : vās, duct + Latin dēferēns, present participle of dēferre, to carry away.]