Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See night blindness.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The inability to see clearly in dim light; night blindness

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.
  • n. See moonblink.

from The Century Dictionary and Cyclopedia

  • n. Night-blindness.
  • n. Day-blindness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder

Etymologies

Late Latin nyctalōpia, from Greek nuktalōps, night-blind : nux, nukt-, night; see nekw-t- in Indo-European roots + alaos, blind + ōps, ōp-, eye; see okw- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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