[ proht-n-oh-pee-uh ]
/ ˌproʊt nˈoʊ pi ə /

noun Ophthalmology.

a defect of vision in which the retina fails to respond to red or green.

Origin of protanopia

From New Latin, dating back to 1900–05; see origin at prot-, an-1, -opia
Related formspro·ta·nop·ic [proht-n-op-ik] /ˌproʊt nˈɒp ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for protanopia


/ (ˌprəʊtəˈnəʊpɪə) /


a form of colour blindness characterized by a tendency to confuse reds and greens and by a loss of sensitivity to red light
Derived Formsprotanopic (ˌprəʊtəˈnɒpɪk), adjective

Word Origin for protanopia

C20: New Latin, from proto- + an- + -opia
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

Medicine definitions for protanopia


[ prō′tə-nōpē-ə ]


A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.