/ Thesaurus / O Synonyms of optical crown Find synonyms for: Noun1. optical crown, crown glass, optical crown glass, optical glassusage: optical glass of low dispersion and low refractive indexWordNet 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