[ en-doh-thee-lee-uhm ]
/ ˌɛn doʊˈθi li əm /
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noun, plural en·do·the·li·a [en-doh-thee-lee-uh]. /ˌɛn doʊˈθi li ə/.
a type of epithelium composed of a single layer of smooth, thin cells that lines the heart, blood vessels, lymphatics, and serous cavities.


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Origin of endothelium

1870–75; endo- + New Latin -thelium;cf. epithelium

OTHER WORDS FROM endothelium

en·do·the·li·al, adjectivesub·en·do·the·li·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use endothelium in a sentence

British Dictionary definitions for endothelium

/ (ˌɛndəʊˈθiːlɪəm) /

noun plural -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 of endothelium

endothelial, adjectiveendothelioid, adjective

Word Origin for endothelium

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

Medical definitions for endothelium

[ ĕn′dō-thēlē-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.

Other words from endothelium

en′do•theli•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for endothelium

[ ĕn′dō-thēlē-əm ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.