1. (

• nacreous

) consisting of or resembling mother-of-pearl ;

2. (

• iridescent ,
• nacreous ,
• opalescent ,
• opaline ,
• pearlescent

) 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" ;