vas deferens /ˌvæz ˈdɛfəɹəns/ noun1 •The duct in the testicle that carries semen from the epididymis to the ejaculatory duct.“Do you love Alexa?” “Woah, I’m not a one-woman man.” Of course not, his vasa deferentia must be on call round-the-clock. — 2008 formsvasa deferentia