eau de Nil /ˌō də ˈnē, ˌoʊ də ˈni
/ ▸ noun a pale greenish color: the room was furnished in eau de Nil
[as modifier] eau-de-Nil walls.
– ORIGIN late 19th century : from French eau-de-Nil, literally ‘water of the Nile’ (from the supposed resemblance in color).