Catoptrics

Webster's Condensed Dictionary- A Condensed Dictionary of the English Language · 1909 · p. 96

ka-top'triks, n. That part of optics which explains the properties and phenomena of reflected light. [Gr. katoptron, a mirror, optomai, I see.] — Catop'tric, -trical, a. Pert, to, etc. Catsup. See Catchup.