Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

postcava
     n : receives blood from lower limbs and abdominal organs and
         empties into the posterior part of the right atrium of
         the heart; formed from the union of the two iliac veins
         [syn: {inferior vena cava}]