eau de nil UK /ˌəʊ.dəˈniːl/US /ˌoʊ.dəˈniːl/adjective 1noun 1forms 3 adjective1 •Of a pale green colour. noun1 •A pale green colour.It was a sprawling town of upended concrete boxes tilting pastel rectangles up towards the hot sun: soft blues, prawn reds, pale chocolates, delicate eau de nils, primrose yellows[…]. — 1968 formseau de Nils · eau de nils · eau-de-nils