• synonyms


  1. Optics. pertaining to dioptrics: dioptric images.
  2. Optics, Ophthalmology. noting or pertaining to refraction or refracted light.
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Also di·op·tri·cal.

Origin of dioptric

From the Greek word dioptrikós, dating back to 1625–35. See diopter, -ic
Related formsdi·op·tri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for dioptric

Historical Examples of dioptric

  • Two methods of lighting have been employed—the Catoptric and the Dioptric systems.

    Grace Darling

    Eva Hope

  • In order to complete the dioptric apparatus a lens is necessary.

    The Origin of Vertebrates

    Walter Holbrook Gaskell

  • We have (with the consent of the author) altered these to the dioptric system.

  • In fishes and reptiles, as Owen has remarked, "The range of gradation of dioptric structures is very great."

  • A new lantern and dioptric apparatus were erected on the tower in 1902.

British Dictionary definitions for dioptric



  1. of or concerned with dioptrics
  2. of or denoting refraction or refracted light
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Derived Formsdioptrically, adverb
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

dioptric in Science


  1. Relating to the refraction of light, especially by a lens. Dioptric lenses are used in Fresnel lenses and camera viewfinders. Compare catadioptric catoptric.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.