/ Dictionary / Index T tetraethyllead: Meaning and Definition of Find definitions for: tet•ra•eth•yl•lead Pronunciation: (te"tru-eth"ul-led'), [key] — n. Chem. a colorless, oily, water-insoluble, poisonous liquid, (CH)Pb, used as an antiknock agent in gasoline. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetraethyl tetraethyl pyrophosphate Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language