/ Thesaurus / L Synonyms of lie detector Find synonyms for: Noun1. lie detector, polygraphusage: a polygraph that records bodily changes sometimes associated with lyingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: coincidence Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language