What does "vena" mean?

Vena: A vein. Vena cava; pl. Venæ cavæ. Etym: [L., literally, hollow vein.] (Anat.) Any one of the great systemic veins connected directly with the heart.-- Vena contracta. Etym: [L., literally, contracted vein.] (Hydraulics) The contracted portion of a liquid jet at and near the orifice from which it issues. -- Vena portæ; pl. VenÆ portæ. Etym: [L., literally, vein of the entrance.] (Anat.) The portal vein of the liver. See under Portal.

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