Definition of day sight in English:

day sight

noun

rare
  • The condition of having better vision in bright than in dim light.

Origin

Early 19th century; earliest use found in Abraham Rees (1743–1825), Presbyterian minister and encyclopaedist. From day + sight, after an erroneous interpretation of hemeralopia.

Pronunciation

day sight

/ˈdeɪ sʌɪt/