/ Dictionary / Index T tetraethyl pyrophosphate: Meaning and Definition of Find definitions for: tetraeth'yl pyrophos'phate Pronunciation: [key] — Chem. Chem. a colorless to amber, hygroscopic, poisonous liquid, (CH)PO, used as an insecticide and as a rodenticide. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetraethyllead tetrafluoride Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language