/ Dictionary / Index H hexaethyl tetraphosphate: Meaning and Definition of Find definitions for: hex•a•eth'yl tetraphos'phate Pronunciation: (hek"su-eth'ul), [key] a yellow, very poisonous liquid, (CHO)PO, soluble in water, used as an insecticide. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hexaemeron hexafluoride Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language