American Heritage® Dictionary of the English Language, Fourth Edition
- n. A flexible optically transparent fiber, usually made of glass or plastic, through which light can be transmitted by successive internal reflections.
- n. Alternative form of optical fibre.
GNU Webster's 1913
- n. (Communications) A thin fiber of very pure glass used to carry signals transmitted by means of light. It has much greater information-carrying capacity than a copper wire, and in the 1990's became a dominant means of transmitting telephone communications over long distances.
- n. a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
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