/ Thesaurus / G Synonyms of glass fiber Find synonyms for: Noun1. optical fiber, glass fiber, optical fibre, glass fibre, fiber, fibreusage: a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit imagesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language