rez-de-chaussée
/ˌreɪdəʃəʊˈseɪ/(also rez-de-chaussee)
noun
Chiefly in France and French-speaking contexts: the ground floor of a building.
Origin
Early 19th century; earliest use found in Catherine Wilmot (c1773–1824). From French rez-de-chaussée from rez at the level of, use as preposition of rez, adjective (of a levelled measure) completely full + de + chaussée road.