Definition of abat–jour
1 : a device (such as a sloping soffit of a lintel or a movable screen) for deflecting daylight downward as it enters a window
2 : skylight
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Origin and Etymology of abat–jour
borrowed from French, literally, “(it) strikes down (abat) the daylight (jour),” from abattre “to strike down” + jour “day, daylight,” going back to Old French jorn, jor, going back to Late Latin diurnum (Latin, “daily ration, daybook”), from neuter of Latin diurnus “daily” — more at abate, diurnal
First Known Use: 1838
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