Breadcrumb Home > Thesaurus > E Synonyms of endothelium Find synonyms for: Noun 1. endothelium, epithelium, epithelial tissue usage: an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of endothelium (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language