Definition of nyctalopia in US English:

nyctalopia

noun

Medicine
  • The inability to see in dim light or at night.

    Also called night blindness
    • ‘Ophthalmologists are occasionally confronted with an individual presenting with nyctalopia (ie, a relatively greater difficulty seeing at night).’
    • ‘The fact that an abnormal result occurs in 26%, however, suggests that ncytalopia should be evaluated with electrophysiological testing even when the fundi appear normal.’
    • ‘About 90% of the female portion of the study suffer from Nyctalopia.’
    • ‘The insensitivity to dim stimuli is accompanied by a mild nyctalopia.’
    • ‘Fundus examination is usually normal, distinguishing it from the progressive conditions causing nyctalopia.’

Origin

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

Pronunciation

nyctalopia

/ˌniktəˈlōpēə//ˌnɪktəˈloʊpiə/