VAS DEFERENS

[vas def.er.ens] n, pl va.sa def.er.en.tia [NL, lit., deferent vessel] (1578): a spermatic duct esp. of a higher vertebrate that in the human male is a thick-walled tube about two feet (0.61 meters) long that begins at and is continuous with the tail of the epididymis and eventually joins the duct of the seminal vesicle to form the ejaculatory duct