WordReference Random House Unabridged Dictionary of American English © 2026
op′tical fi′ber, 
  1. Optics, Telecommunicationsa very thin, flexible glass or plastic strand along which large quantities of information can be transmitted in the form of light pulses: used in telecommunications, medicine, and other fields. Also called light guide. 
Cf. fiber optics, waveguide. 
  • 1960–65

'optical fiber' also found in these entries (note: many are not synonyms or translations):
fiber - fiber optics - light guide - light pipe - waveguide

Forum discussions with the word(s) "optical fiber" in the title:


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