noun (used with a singular verb) the branch of optics dealing with the formation of images by mirrors.
Origin: 1560–70; <
Greek katoptrikós, equivalent to
kátoptr(
on) mirror (
kat- cat- +
op- see +
-tron suffix of instruments) +
-ikos -ic; see -ics Related formsca·top·tric, ca·top·tri·cal, adjective
ca·top·tri·cal·ly, adverb