optical fiber op·ti·cal·fiber uncommon noun 1. a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images Synonymsoptical fiberglass fiberoptical fibreglass fibre Related words Broader terms fiber Parts fiber optic cablefiberscope WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
