One of the mysteries of the English language finally explained.
Colour blindness resulting from insensitivity to green light, causing confusion of greens, reds, and yellows.Compare with protanopia
- ‘Here's a handy list: primary atypical pneumonia, humectant, lapis lazuli, magniloquent, magnetohydrodynamic, deuteranopia, bryology, vorlage, Wesleyan.’
- ‘But it's important to remember that a measurable percentage of men have red-green colorblindness (deuteranopia); instructing them to click the green box for yes or the red box for no, for example, should be avoided.’
- ‘Red-green deficiency (deuteranopia) is the most frequently diagnosed deficiency.’
- ‘The genetic cause has been determined for several color vision defects, achromatopsia (the loss of all color vision), blue monochromatism, protanopia, deuteranopia, and enhanced S-cone syndrome.’
Early 20th century: from deutero- ‘second’ (the colour green being regarded as the second component of colour vision) + an- + -opia.
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