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[en-doh-thee-lee-uh m] /ˌɛn doʊˈθi li əm/
noun, plural endothelia
[en-doh-thee-lee-uh] /ˌɛn doʊˈθi li ə/ (Show IPA)
a type of epithelium composed of a single layer of smooth, thin cells that lines the heart, blood vessels, lymphatics, and serous cavities.
Origin of endothelium
1870-75; endo- + New Latin -thelium; cf. epithelium
Related forms
endothelial, adjective
subendothelial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for endothelium


noun (pl) -lia (-lɪə)
a tissue consisting of a single layer of cells that lines the blood and lymph vessels, heart, and some other cavities
Derived Forms
endothelial, adjective
endothelioid, adjective
Word Origin
C19: New Latin, from endo- + -thelium, from Greek thēlē nipple
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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endothelium in Medicine

endothelium en·do·the·li·um (ěn'dō-thē'lē-əm)
n. pl. en·do·the·li·a (-lē-ə)
A thin layer of flat epithelial cells that lines serous cavities, lymph vessels, and blood vessels.

en'do·the'li·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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endothelium in Science
Plural endothelia
A thin layer of flat epithelial cells that lines the lymph vessels, blood vessels, and the inner cavities of the heart. Compare mesothelium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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