from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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. The condition may result from vitamin A deficiency, disease, or hereditary factors. Also called nyctalopia.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The optic condition nyctalopia, the inability to see clearly in faint light, as at night
from the GNU version of the Collaborative International Dictionary of English
- n. See Hemeralopia.
from The Century Dictionary and Cyclopedia
- n. Inability to see in a dim light; nyctalopia. Also called daysight. See nyctalopia and hemeralopia.
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
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