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endocardium

[en-doh-kahr-dee-uh m]
noun, plural en·do·car·di·a [en-doh-kahr-dee-uh] /ˌɛn doʊˈkɑr di ə/. Anatomy.
  1. the serous membrane that lines the cavities of the heart.
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Origin of endocardium

First recorded in 1870–75; endo- + -cardium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for endocardium

endocardium

noun plural -dia (-dɪə)
  1. the membrane that lines the cavities of the heart and forms part of the valves
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Word Origin

C19: from New Latin, from endo- + Greek kardia heart
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

endocardium in Medicine

endocardium

(ĕn′dō-kärdē-əm)
n. pl. en•do•car•di•a (-dē-ə)
  1. The thin serous membrane, composed of endothelial and subendothelial tissue, that lines the interior of the heart.
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Related formsen′do•cardi•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.