or chiefly Brit  fibre optics  n pl 1  :  thin transparent fibers of glass or plastic that are enclosed by material of a lower index of refraction and that transmit light throughout their length by internal reflections : also  :  a bundle of such fibers used in an instrument (as for viewing body cavities)  2  sing in constr  :  the technique of the use of fiber optics fi*ber-op*tic or chiefly Brit  fi*bre-op*tic  adj 
 
 
 
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