• synonyms


[awr-thuh-kroh-mat-ik, -thoh-kruh-]
adjective Photography.
  1. representing correctly the relations of colors as found in a subject; isochromatic.
  2. (of an emulsion) sensitive to all visible colors except red; isochromatic.
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Origin of orthochromatic

First recorded in 1885–90; ortho- + chromatic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for orthochromatic

Historical Examples

  • Orthochromatic results exhibited by Dixon and Sons at the photographic exhibition in October.

    The Evolution of Photography

    John Werge

  • On the few occasions when orthochromatic plates are used the lamp need not be lighted.

  • In actual practice an orthochromatic mixture of frequencies is used to give a black, gray and white picture.

    The Airlords of Han

    Philip Francis Nowlan

  • I will give to a common plate about four seconds, an orthochromatic plate under the same conditions five seconds.

  • The isochromatic and orthochromatic plates on the market are corrected, and are the best to use.

British Dictionary definitions for orthochromatic


  1. photog of or relating to an emulsion giving a rendering of relative light intensities of different colours that corresponds approximately to the colour sensitivity of the eye, esp one that is insensitive to red lightSometimes shortened to: ortho Compare panchromatic
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Derived Formsorthochromatism (ˌɔːθəʊˈkrəʊməˌtɪzəm), noun
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

orthochromatic in Medicine


  1. Staining with the same color as that of the dye used. Used of a cell or tissue.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.