myocardium

From New Latin myocardium, from Ancient Greek μῦς (mûs, “muscle”) + καρδίᾱ (kardíā, “heart”).

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myocardium (plural myocardiums or myocardia)

1. (anatomy, cardiology) The muscular substance of the heart; the middle of the three layers forming the outer wall of the human heart.

• (muscular substance of the heart): cardiac muscle, heart muscle

• (muscular substance of the heart): muscle

• “myocardium”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “myocardium”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• cardiac muscle on Wikipedia.Wikipedia

• (Classical Latin) IPA^(key): [my.ɔˈkar.di.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [mi.oˈkar.d̪i.um]

myocardium n (genitive myocardiī or myocardī); second declension

1. myocardium
2. muscular substance of the heart

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).