# mesothelium

> English word · Noun

## Definitions
1. A membrane of flat epithelial cells that lines the body cavity of embryos and forms the squamous cells of the peritoneum, pericardium, and pleura

## Etymology
From meso- + -thelium.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mesothelium