Literally meaning: “muscle heαrt”
Origin: Anc Greek
μυo/myo-(=combining form denoting muscle) >mys/ (=muscle, mouse) > μύω/myo(=enclosed, like the muscle inside body or the rat in its nest=epimys)
+ καρδία /kardia (=heart) > derived according Meletios(7th-8th cen AD) probably from verb >κραδαίνω/kradeno (=rattle, rock)
+um =latin suffix that forms singular nouns
Myocardium is the middle and muscular tissue of the heart.