American Heritage® Dictionary of the English Language, Fourth Edition
- n. A visual defect characterized by the inability to see as clearly in bright light as in dim light.
Century Dictionary and Cyclopedia
- n. In pathology, a defect of sight in consequence of which distinct vision is possible only in artificial or dim light; day-blindness. The term is also used, however, to express exactly the opposite defect of vision. See nyctalopia.
- n. medicine The inability to see clearly in bright light; day blindness
GNU Webster's 1913
- n. (Med.) A disease of the eyes, in consequence of which a person can see clearly or without pain only by daylight or a strong artificial light; day sight.
- n. inability to see clearly in bright light
- New Latin, from Greek hēmeralōps, suffering from hemeralopia : hēmera, day + alaos, blind + ōps, eye; see nyctalopia. (American Heritage® Dictionary of the English Language, Fourth Edition)
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