Definition of abat-jour in English:

abat-jour

(also abajour, abatjour)

noun

  • An architectural device for deflecting the light from a wall or roof opening in a particular direction; specifically (a) a skylight set in an angled or slanting aperture or light well; (b) a screen on the outside of a window angled outward and upward so as to allow light into the room while at the same time obscuring the view below.

Origin

Mid 19th century; earliest use found in John Britton (1771–1857), antiquary and topographer. From French abat-jour, † abajour kind of skylight, light well, kind of shutter or screen on a window directing the daylight, kind of lampshade reflecting and directing the light from abat, 3rd singular present indicative of abatre to cast down + jour day, daylight.

Pronunciation:

abat-jour

/əˌbatˈʒʊə/