Etymology
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vas (n.)

in anatomy, "a tube, duct, or conduit for conveying blood, lymph, semen, etc.," plural vasa, Latin, literally "vessel." Vas deferens (plural vasa defferentia) is from 1570s.

updated on March 08, 2014

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Definitions of vas from WordNet

vas (n.)
a tube in which a body fluid circulates;
Synonyms: vessel
From wordnet.princeton.edu, not affiliated with etymonline.