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catoptrics

[kuh-top-triks] /kəˈtɒp trɪks/
noun, (used with a singular verb)
1.
the branch of optics dealing with the formation of images by mirrors.
Origin
1560-1570
1560-70; < Greek katoptrikós, equivalent to kátoptr(on) mirror (kat- cat- + op- see + -tron suffix of instruments) + -ikos -ic; see -ics
Related forms
catoptric, catoptrical, adjective
catoptrically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for catoptric

catoptrics

/kəˈtɒptrɪks/
noun
1.
(functioning as sing) the branch of optics concerned with reflection, esp the formation of images by mirrors
Derived Forms
catoptric, 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
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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
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catoptric in Science
catoptric
  (kə-tŏp'trĭk)   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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18
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