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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.
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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 catoptrics

catoptrics

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