/ Thesaurus / O Synonyms of optical instrument Find synonyms for: Noun1. optical instrument, instrumentusage: an instrument designed to aid visionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language