/ Dictionary / Index H hexahemeron: Meaning and Definition of Find definitions for: hex•a•hem•er•on Pronunciation: (hek"su-hem'u-ron"), [key] — n. hexaemeron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hexahedron hexahydrate Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language