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The Collaborative International Dictionary of English v.0.48:

Vas \Vas\, n.; pl. Vasa. [L., a vessel. See Vase.] (Anat.) A vessel; a duct. [1913 Webster] Vas deferens; pl. Vasa deferentia. [L. vas vessel + deferens carrying down.] (Anat.) The excretory duct of a testicle; a spermatic duct. [1913 Webster]