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From The Collaborative International Dictionary of English v.0.48:
Vena \Ve"na\, n.; pl. Venae. [L. See Vein.] A vein. [1913 Webster] Vena cava; pl. Venae cavae. [L., literally, hollow vein.] (Anat.) Any one of the great systemic veins connected directly with the heart. Vena contracta. [L., literally, contracted vein.] (Hydraulics) The contracted portion of a liquid jet at and near the orifice from which it issues. Vena portae; pl. Venae portae. [L., literally, vein of the entrance.] (Anat.) The portal vein of the liver. See under Portal. [1913 Webster]