||Hem`e*ra*lo"pi*a (?), 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.

&fist; Some writers (as Quain) use the word in the opposite sense, i. e., day blindness. See Nyctalopia.