daltonism

[dawl-tn-iz-uhm]

dal·ton·ism

[dawl-tn-iz-uhm]
noun (sometimes initial capital letter) Pathology.
color blindness, especially the inability to distinguish red from green.

Origin:
1835–45; J. Dalton + -ism

dal·ton·ic [dawl-ton-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Daltonism is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
daltonism (ˈdɔːltəˌnɪzəm)
 
n
colour blindness, esp the confusion of red and green
 
[C19: from French daltonisme, after John Dalton]
 
daltonic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

daltonism dal·ton·ism (dôl'tə-nĭz'əm)
n.
An inherited defect in the perception of red and green; red-green colorblindness.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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