Pronunciation: - ˌ pig-m ə n- ' t ō -s ə , -( ˌ )men-, -z ə
Function: noun
Etymology: New Latin, pigmented retinitis
Date: 1861
: any of several hereditary progressive degenerative diseases of the eye marked by night blindness in the early stages, atrophy and pigment changes in the retina, constriction of the visual field, and eventual blindness