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daltonism

American  
[dawl-tn-iz-uhm] / ˈdɔl tnˌɪz əm /

noun

(sometimes initial capital letter)

  1. color blindness, especially the inability to distinguish red from green.

daltonism British  
/ ˈdɔːltəˌnɪzəm, dɔːlˈtɒnɪk /

noun

  1. colour blindness, esp the confusion of red and green

"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

Other Word Forms

  • daltonic adjective

Etymology

Origin of daltonism

1835–45; J. Dalton + -ism

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.