The Collaborative International Dictionary
Mesogloea
Mesogloea \Mes`o*gl[oe]"a\, n. [NL., fr. Gr. me`sos middle + ? a glutinous substance.] (Zo["o]l.) A thin gelatinous tissue separating the ectoderm and endoderm in certain c[oe]lenterates. -- Mes`o*gl[oe]"al, a.
Wiktionary
mesogloea
n. (alternative form of mesoglea English)