/ Thesaurus / E Synonyms of expert witness Find synonyms for: Noun1. expert witness, witnessusage: a witness who has knowledge not normally possessed by the average person concerning the topic that he is to testify aboutWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language