vena cava Definition in Cambridge British English Dictionary
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Definition of "vena cava" - British English Dictionary

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vena cavanoun [C]

uk   us   /ˌviː.nəˈkeɪ.və/ (plural venae cavae ) specialized
one of the two very large veins through which blood returns to the heart, one from the upper body and head and one from all of the body below the chest: The superior (= upper) and inferior (= lower) venae cavae collect blood that has circulated around the body.
(Definition of vena cava from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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