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mesothelium

Pronunciation: /ˌmɛsə(ʊ)ˈθiːlɪəm, ˌmɛz-, ˌmiːs-, ˌmiːz-/

Definition of mesothelium

noun (plural mesothelia)

[mass noun] Anatomy

the epithelium that lines the pleurae, peritoneum, and pericardium.
Embryology the surface layer of the embryonic mesoderm, from which the mesothelium is derived.