daltonism

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
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World English Dictionary
daltonism (ˈdɔːltəˌnɪzəm) [Click for IPA pronunciation guide]
 
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
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00:10
Daltonism is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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
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