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noun Nyctalopia n. (Med.) (a)A disease of the eye, in consequence of which the patient can see well in a faint light or at twilight, but is unable to see during the day or in a strong light; day blindness. (b)See Moonblink. Note: Some writers (as Quain) use the word in the opposite sense, night blindness. See Hemeralopia.
Collaborative International Dictionary of English 0.48
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