Catoptric light

from The Collaborative International Dictionary of English v.0.48

Catoptric \Ca*top"tric\, Catoptrical \Ca*top"tric*al\, a. [Gr.
   ?. See {Catopter}.]
   Of or pertaining to catoptrics; produced by reflection.
   [1913 Webster]

   {Catoptric light}, a light in which the rays are concentrated
      by reflectors into a beam visible at a distance.
      [1913 Webster]