Nacreous
Today’s English Word of the Day is “nacreous” (NEY kree us):
1. [adj] having a play of lustrous rainbow-like colors; “an iridescent oil slick”; “nacreous (or pearlescent) clouds looking like mother-of-pearl”; “a milky opalescent (or opaline) luster”2. [adj] consisting of or resembling mother-of-pearl