optical fiber(n = noun.artifact) glass fiber, glass fibre, optical fibre - a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images;
is a kind of fiber, fibre
is a part of fiber optic cable, fibre optic cable, fiberscope

   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. [PJC]

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