vas noun. [vas] Pl. vasa ['veɪsǝ]. L16.
[Latin = vessel.]
Anatomy, Botany, & Zoology. A duct or vessel by which fluid is conveyed; ellipt. the vas deferens (see below). Chiefly in mod. Latin phrs.
vas deferens ['dɛfǝrɛnz], pl. vasa deferentia [dɛfǝ'rɛnʃɪǝ], [medieval Latin: see DEFERENT adjective¹] Anatomy the spermatic duct which runs from the testicle to the urethra. vas vasorum [veɪ'sɔ:rǝm], pl. vasa vasorum, [genit. pl. of Latin vas vessel] Anatomy each of the very small arteries that supply nutrients to the walls of larger blood-vessels.

■ vasal ['veɪs(ǝ)l] adjective L19.

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