/ Dictionary / Index H Heraclius: Meaning and Definition of Find definitions for: Her•a•cli•us Pronunciation: (her"u-klī'us, hi-rak'lē-us), [key] — n. a.d. 575?–641, Byzantine emperor 610–641. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Heraclitus Herakleion Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language