endocardium
noun
en·do·car·di·um
ˌen-dō-ˈkär-dē-əm 
plural endocardia
ˌen-dō-ˈkär-dē-ə
: a thin serous membrane lining the cavities of the heart
Examples of endocardium in a Sentence
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One in the outer layer — epicardium — of the heart and the other in the inner layer — endocardium — of the heart.
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Monica Cull, Discover Magazine, 22 July 2022
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Monica Cull, Discover Magazine, 22 July 2022
Cite this Entry
“Endocardium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/endocardium. Accessed 3 Nov. 2025.
Copy CitationMedical Definition
endocardium
noun
en·do·car·di·um
-ˈkärd-ē-əm
plural endocardia
-ē-ə
: a thin serous membrane lining the cavities of the heart
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