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catoptrics

[kuh-top-triks]
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noun (used with a singular verb)
  1. the branch of optics dealing with the formation of images by mirrors.

Origin of catoptrics

1560–70; < Greekkatoptrikós, 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, adjectiveca·top·tri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for catoptric

catoptrics

noun
  1. (functioning as singular) the branch of optics concerned with reflection, esp the formation of images by mirrors
Derived Formscatoptric or catoptrical, adjective

Word Origin

C18: from Greek katoptrikos, from katoptron mirror
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for catoptric

adj.

"pertaining to mirrors or a mirror," 1774, from Latinized form of Greek katoptrikos, from katoptron "mirror," from kata- "against" (see cata-) + stem of optos "seen, visible" (see optic) + instrumental suffix -tron. Related: Catoptrics; catoptrical.

Online Etymology Dictionary, © 2010 Douglas Harper

catoptric in Science

catoptric

[kə-tŏptrĭk]
  1. Relating to the reflection of light, especially by a mirror. Catoptric lenses are used in Fresnel lenses and many telescopes. Compare catadioptric dioptric.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.