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French word rez-de-chaussée comes from French rez (Ground floor (only in rez-de-chaussée and rez-de-jardin).), French chaussée (Causeway. Highway; street. Surface (of road).)
rez (French)
Ground floor (only in rez-de-chaussée and rez-de-jardin).
chaussée (French)
Causeway. Highway; street. Surface (of road).
rez-de-chaussée (French)
Ground floor.