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[mahy-uh-kahr-dee-uh m] /ˌmaɪ əˈkɑr di əm/
noun, plural myocardia
[mahy-uh-kahr-dee-uh] /ˌmaɪ əˈkɑr di ə/ (Show IPA).
the muscular substance of the heart.
Origin of myocardium
First recorded in 1875-80; myo- + -cardium
Related forms
myocardial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for myocardium


noun (pl) -dia (-dɪə)
the muscular tissue of the heart
Word Origin
C19: myo- + cardium, from 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
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Word Origin and History for myocardium

1866, from myo- + Latinized form of Greek kardia "heart" (see heart). Related: Myocardial; myocarditis.

Online Etymology Dictionary, © 2010 Douglas Harper
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myocardium in Medicine

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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