/ Thesaurus / L Synonyms of lead tetraethyl Find synonyms for: Noun1. tetraethyl lead, lead tetraethyl, antiknockusage: a clear oily poisonous liquid added to gasoline to prevent knockingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language