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English definition of “vena cava”

vena cava

noun [C] uk   /ˌviː.nəˈkeɪ.və/ (plural venae cavae) specialized us  
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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