The Collaborative International Dictionary
Vasa deferentia
Vas \Vas\, n.; 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.
Wiktionary
vasa deferentia
n. (vas deferens English)