noun, plural myocardia [mahy-uh-kahr-dee-uh] . Anatomy.
the muscular substance of the heart.

1875–80; myo- + -cardium

myocardial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
myocardium (ˌmaɪəʊˈkɑːdɪəm)
n , pl -dia
the muscular tissue of the heart
[C19: myo- + cardium, from Greek kardia heart]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1866, from myo-, comb. form of Gk. mys (gen. myos) "muscle" (see muscle) + kardia "heart" (see heart). Related: Myocardial.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

myocardium my·o·car·di·um (mī'ō-kär'dē-əm)
n. pl. my·o·car·di·a (-dē-ə)
The middle layer of the heart, consisting of cardiac muscle.

my'o·car'di·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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