'opaline' definitions:

Definition of 'opaline'

From: WordNet
adjective
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" [syn: iridescent, nacreous, opalescent, opaline, pearlescent]