*scotomy*

n. [ NL. scotomia, from Gr. &unr_; dizziness, fr. &unr_; to darken, fr. sko`tos darkness: cf. F. scotomie. ] 1. Dizziness with dimness of sight. [ Obs. ] Massinger. [ 1913 Webster ]

2. (Med.) Obscuration of the field of vision due to the appearance of a dark spot before the eye. [ 1913 Webster ]