GNU Collaborative International Dictionary of English

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  1.       

    ‖Hemeralopia , n. [NL., fr. Gr. , the opposite of ;  day +  of . See Nyctalopia.] (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.
    1913 Webster
    ☞ Some writers (as Quain) use the word in the opposite sense, i. e., day blindness. See Nyctalopia.
    1913 Webster

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