epicardium

New Latin, from Latin epi- (“over”) + Ancient Greek καρδία (kardía, “heart”). Attested in English from the 19th century.

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epicardium (plural epicardiums or epicardia)

1. (anatomy) The layer of tissue between the pericardium and the heart.

• “epicardium”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “epicardium”, in The American Heritage Dictionary of the English Language, 5th edition, Boston, Mass.: Houghton Mifflin Harcourt, 2016, →ISBN.