protanopia

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  - prostrate
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  - prosy
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  - protactinium
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  - protandrous
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Concise Oxford English Dictionary © 2008 Oxford University Press:
protanopia /ˌprəʊtəˈnəʊpɪə/

▶noun colour blindness resulting from insensitivity to red light, causing confusion of greens, reds, and yellows. Compare with deuteranopia, tritanopia.

– origin early 20th cent.: from proto- ‘original’ (red being regarded as the first component of colour vision) + an-1 + -opia.

'protanopia' also found in these Oxford entries:

daltonism - deuteranopia - prot- - protanope - tritanopia

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protanopia