Definition of nyctalopia in English:


Line breaks: nyc¦tal|opia
Pronunciation: /ˌnɪktəˈləʊpɪə


[mass noun] Medicine
  • A condition characterized by an abnormal inability to see in dim light or at night, typically caused by vitamin A deficiency.
    More example sentences
    • Fundus examination is usually normal, distinguishing it from the progressive conditions causing nyctalopia.
    • The insensitivity to dim stimuli is accompanied by a mild nyctalopia.
    • Ophthalmologists are occasionally confronted with an individual presenting with nyctalopia (ie, a relatively greater difficulty seeing at night).


late 17th century: via late Latin from Greek nuktalōps, from nux, nukt- 'night' + alaos 'blind' + ōps 'eye'.

More definitions of nyctalopia

Definition of nyctalopia in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
elaborate ornamentation of a vocal melody