The Collaborative International Dictionary of English v.0.48:

Coelia \C[oe]"li*a\, n. [NL., fr. Gr. koili`a a cavity of the
   body, a ventricle.] (Anat.)
   A cavity.
   [1913 Webster]

   Note: The word is applied to the ventricles of the brain, the
         different ventricles being indicated by prefixes like
         those characterizing the parts of the brain in which
         the cavities are found; as, epic[oe]lia, mesoc[oe]lia,
         metac[oe]lia, proc[oe]lia, etc. --B. G. Wilder.
         [1913 Webster] Coeliac