The Collaborative International Dictionary
Postcavae
Postcava \Post"ca`va\, n.; pl. Postcav[ae] . [NL. See Post-,
and Cave, n.] (Anat.)
The inferior vena cava. -- Post"ca`val, a.
--B. G. Wilder.
Wiktionary
postcavae
n. (plural of postcava English)