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daltonism

[dawl-tn-iz-uh m]
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noun (sometimes initial capital letter) Pathology.
  1. color blindness, especially the inability to distinguish red from green.
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Origin of daltonism

1835–45; J. Dalton + -ism
Related formsdal·ton·ic [dawl-ton-ik] /dɔlˈtɒn ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for daltonic

daltonism

noun
  1. colour blindness, esp the confusion of red and green
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Derived Formsdaltonic (dɔːlˈtɒnɪk), adjective

Word Origin

C19: from French daltonisme, after John Dalton
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
daltonic in Medicine

daltonism

(dôl′tə-nĭz′əm)
n.
  1. An inherited defect in the perception of red and green; red-green colorblindness.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.