
1) Cardiac muscle 2) Heart muscle
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https://www.crosswordclues.com/clue/myocardium

• (n.) The main substance of the muscular wall of the heart inclosed between the epicardium and endocardium.
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http://thinkexist.com/dictionary/meaning/myocardium/

(from the article `muscle`) ...body and thereby transports nutrients, breakdown products, antibodies, hormones, and gases to and from the tissues. The heart consists mostly of ... ...or the lining of the heart, the coelomic cavity in the lateral plate mesoderm adjoining the heart rudiment expands slightly and envelops the ... [7 rela...
Found on
http://www.britannica.com/eb/a-z/m/147

Heart muscle.
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http://www.cat-world.com.au/glossary

<anatomy> A term used to describe the middle layer of the heart wall (heart muscle). ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973

(mi″o-kahr´de-әm) the middle and thickest layer of the heart wall, composed of cardiac muscle. adj., myocar´dial., adj.
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http://www.encyclo.co.uk/local/21001

Heart muscle
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http://www.encyclo.co.uk/visitor-contributions.php

Middle and thickest layer of the wall of the heart, composed of cardiac muscle.
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http://www.encyclo.co.uk/visitor-contributions.php
My`o·car'di·um noun [ New Latin , from Greek ..., ..., muscle + ... heart.]
(Anat.) The main substance of the muscular wall of the heart inclosed between the epicardium and endocardium.
Found on
http://www.encyclo.co.uk/webster/M/123

The middle of the three layers which form the walls of the heart.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

Type: Term Pronunciation: mī′ō-kar′dē-ŭm, -kar′dē-ă Definitions: 1. The middle layer of the heart, consisting of cardiac muscle.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=58389

Myocardium: The heart muscle.
Found on
http://www.medterms.com/script/main/art.asp?articlekey=4487

(mi;uo-kar;de-um) The cardiac muscle layer of the heart.
Found on
http://www.mhhe.com/biosci/abio/glossary.mhtml

The wall of the heart is composed of cardiac muscle tissue, referred to as
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http://www.probertencyclopaedia.com/browse/EM.HTM

The middle, muscular layer of the heart.
Found on
http://www.swsbm.com/ManualsMM/MedHerbGloss2.txt

The muscular layer of the heart; heart muscle.
Found on
http://www.thehorse.com/Glossary.xhtml?L=M

[
n] - the middle muscular layer of the heart wall
Found on
http://www.webdictionary.co.uk/definition.php?query=myocardium

the medical term for heart muscle
Found on
https://www.encyclo.co.uk/local/20875
noun the middle muscular layer of the heart wall
Found on
https://www.encyclo.co.uk/local/20974

Greek mys = muscle, and kardia = heart, adjective - myocardial.
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https://www.encyclo.co.uk/local/21450

the muscular substance of the heart.
Found on
https://www.infoplease.com/dictionary/myocardium

the muscular layer of the heart.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc

The muscular wall of the heart. It contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood.
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z
No exact match found.