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Noun: nyctalopia  ,nik-tu'low-pee-u
  1. Inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder
    - night blindness, moon blindness

Derived forms: nyctalopias

Type of: avitaminosis, hypovitaminosis, vision defect, visual defect, visual disorder, visual impairment

Encyclopedia: Nyctalopia