Origin of nyctalopia

1675–85; < Late Latin nyctalōpia < Greek nykt- nyct- + al(aós) blind + -ōpia -opia
Related formsnyc·ta·lop·ic [nik-tl-op-ik] /ˌnɪk tlˈɒp ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nyctalopia

Historical Examples of nyctalopia

British Dictionary definitions for nyctalopia


  1. inability to see normally in dim lightNontechnical name: night blindness Compare hemeralopia

Word Origin for nyctalopia

C17: via Late Latin from Greek nuktálōps, from nux night + alaos blind + ōps eye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

nyctalopia in Medicine


  1. A condition of the eyes in which vision is normal in daylight or other strong light but is abnormally weak or completely lost at night or in dim light and that results from vitamin A deficiency, disease, or hereditary factors.night blindness
Related formsnyc′ta•lopic (-lōpĭk, -lŏpĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.