Word Study
vas
CIDE DICTIONARY
vas, n. [L., a vessel. See Vase.].
A vessel; a duct. [1913 Webster]
OXFORD DICTIONARY
vas, n. (pl. vasa) Anat. a vessel or duct.
Idiom
vas deferens (pl. vasa deferentia) Anat. the spermatic duct from the testicle to the urethra.
Derivative
vasal adj.
Etymology
L, = vessel
For further exploring for "vas" in Webster Dictionary Online