Adjacent Words

nyctalopia definitions

	Tweet

WordNet (r) 3.0 (2005)

n
1: inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder [syn: nyctalopia, night blindness, moon blindness]

Merriam Webster's

noun Etymology: New Latin, from Latin nyctalops suffering from night blindness, from Greek nyktalops, from nykt-, nyx night + alaos blind + ?p-, ?ps eye — more at night, eye Date: 1684 night blindness

Oxford Reference Dictionary

n. the inability to see in dim light or at night. Also called night-blindness. Etymology: LL f. Gk nuktalops f. nux nuktos night + alaos blind + ops eye

Webster's 1913 Dictionary

Nyctalopia Nyc`ta*lo"pi*a, n. [L. nyctalopia, fr. nyctalops a nyctalops, Gr. ?. Gr. ? meant, a person affected either with day blindness or with night blindness, and in the former case was derived fr. ?, ?, night + ?, ?, the eye; in the latter, fr. ? + ? blind + ?.] (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.