/ Dictionary / Index E epimyocardium: Meaning and Definition of Find definitions for: ep•i•my•o•car•di•um Pronunciation: (ep"u-mī"u-kär'dē-um), [key] — pl. -di•a the outer, mesodermal layer of the embryonic heart, which develops into the epicardium and the myocardium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. epimorphosis epimysium Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language