Definition of scotopia in US English:

scotopia

noun

Physiology
  • Vision in conditions of low light, specifically when the eye is adapted to such conditions; dark-adapted vision; night vision.

Origin

Early 20th century; earliest use found in John Herbert Parsons (1868–1957), ophthalmologist and physiologist. From scoto- + -opia; apparently coined by J. H. Parsons. Compare photopia.

Pronunciation

scotopia

/skə(ʊ)ˈtəʊpɪə/