The Collaborative International Dictionary
Catoptrical
Catoptric \Ca*top"tric\, Catoptrical \Ca*top"tric*al\, a. [Gr. ?. See Catopter.] Of or pertaining to catoptrics; produced by reflection.
Catoptric light, a light in which the rays are concentrated by reflectors into a beam visible at a distance.
Wiktionary
catoptrical
a. (alternative form of catoptric English)
WordNet
catoptrical
adj. of or relating to catoptrics; produced by or based on mirrors [syn: catoptric]