endocardium

en·do·car·di·um

[en-doh-kahr-dee-uhm]
noun, plural en·do·car·di·a [-dee-uh] . Anatomy.
the serous membrane that lines the cavities of the heart.

Origin:
1870–75; endo- + -cardium

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World English Dictionary
endocardium (ˌɛndəʊˈkɑːdɪəm) [Click for IPA pronunciation guide]
 
n , pl -dia
the membrane that lines the cavities of the heart and forms part of the valves
 
[C19: from New Latin, from endo- + Greek kardia heart]

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00:10
Endocardium is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
American Heritage
Medical Dictionary

endocardium en·do·car·di·um (ěn'dō-kär'dē-əm)
n. pl. en·do·car·di·a (-dē-ə)
The thin serous membrane, composed of endothelial and subendothelial tissue, that lines the interior of the heart.


en'do·car'di·al adj.

The American Heritage® Stedman's Medical Dictionary
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