Nyc'ta-lō'pi-ā, n.

n. [Lat. nyctalopia, nyctalopa, Fr. nyctalopie, Gr. νυκταλωπία. See infra.] (Med.) A disease of the eye, in consequence of which the patient can see well in a faint light or at night, but is unable to see during the day or in a strong light.

☞ The term is sometimes applied also to night-blindness, or hemeralopia.