nyctalopia noun. [nɪktǝ'lǝʊpɪǝ] Also Anglicized as nyctalopy. L17.
[Late Latin, formed as NYCTALOPS + -IA¹.]
1. Chiefly Medicine. Reduction or loss of vision in dim light, due to disorder of the retinal rods, as caused by vitamin A deficiency; night-blindness. L17.

2. [By confusion.] = HEMERALOPIA 1. Now rare. L17.

■ nyctalopic adjective of the nature of or exhibiting nyctalopia M19.

[TahlilGaran] English Dictionary ▲