/ Dictionary / Index M megalocardia: Meaning and Definition of Find definitions for: meg•a•lo•car•di•a Pronunciation: (meg"u-lō-kär'dē-u), [key] — n. Pathol. hypertrophy of the heart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megalocardia (Thesaurus) megaloblast megalocephalic Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language