Nyctalopia
Pronunciation : Nyc`ta*lo"pi*a
Part of Speech : n.
Etymology : [L. nyctalopia, fr. nyctalops a nyctalops, Gr. (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.
Definition : Note: Some writers (as Quain) use the word in the opposite sense, night blindness. See Hemeralopia.
Source : Webster's Unabridged Dictionary, 1913