Origin: Latin suffix -ous
Nacreous has 3 different meanings across 1 category:
consisting of or resembling mother-of-pearl
having a play of lustrous rainbow colors
"an iridescent oil slick"
"nacreous (or pearlescent) clouds looking like mother-of-pearl"
"a milky opalescent (or opaline) luster"
Of, or resembling nacre (mother of pearl).