Source : Webster's Revised Unabridged Dictionary (1913)

Pseudocoelia \Pseu`do*c[oe]"li*a\, n. [NL., fr. Gr. pseydh`s
   false + ? hollow.] (Anat.)
   The fifth ventricle in the mammalian brain. See {Ventricle}.
   --B. G. Wilder.