Mesothelium
Pronunciation : Mes`o*the"li*um
Part of Speech : n.
Etymology : [NL., fr. Gr. thelium.] (Biol.)
Definition : Defn: Epithelial mesoderm; a layer of cuboidal epithelium cells, formed from a portion of the mesoderm during the differetiation of the germ layers. It constitutes the boundary of the coelum.
Source : Webster's Unabridged Dictionary, 1913