achromatopsia

a·chro·ma·top·si·a

[ey-kroh-muh-top-see-uh]
noun Pathology.
color blindness ( def 2 ).
Also, a·chro·ma·to·pi·a [ey-kroh-muh-toh-pee-uh] , a·chro·ma·top·sy [ey-kroh-muh-top-see] .


Origin:
a-6 + chromat- + -opsia

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Medical Dictionary

achromatopsia a·chro·ma·top·si·a (ə-krō'mə-tŏp'sē-ə) or a·chro·ma·top·sy (ə-krō'mə-tŏp'sē)
n.
A severe congenital deficiency in color perception, often associated with nystagmus and reduced visual acuity. Also called achromatic vision, monochromatism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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00:10
achromatopsia has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
given to using long words.
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