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The Collaborative International Dictionary
Praecava

Praecava \Pr[ae]"ca`va\, n. [NL. See Pre-, and 1st Cave.] (Anat.) The superior vena cava. -- Pr[ae]"ca`val, a.
--B. G. Wilder.

Wiktionary
praecava

n. (context anatomy English) The superior vena cava.