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French word abat-jour comes from French abattre, French jour (Day. Daylight, light. Opening, aperture.)
abattre (French)
(pronominal) to descend upon with violence or furor. (pronominal, of lightning) to strike. (reflexive) to fall down, especially of tall things, such as trees. To butcher; to slaughter for meat. To cut down (a tree). To destroy or demolish (a wall). To shoot dead.
jour (French)
Day. Daylight, light. Opening, aperture.
abat-jour (French)
(architecture) skylight. (dated) eyeshade. Lampshade.