Meso*gl[oe]"al

from The Collaborative International Dictionary of English v.0.48

Mesogloea \Mes`o*gl[oe]"a\, n. [NL., fr. Gr. me`sos middle + ? a
   glutinous substance.] (Zool.)
   A thin gelatinous tissue separating the ectoderm and endoderm
   in certain coelenterates. -- {Mes`o*gl[oe]"al}, a.
   [1913 Webster]