Definitions for opalescentˌoʊ pəˈlɛs ənt
Random House Webster's College Dictionary
o•pal•es•centˌoʊ pəˈlɛs ənt(adj.)
exhibiting a play of colors like that of the opal.
having a milky iridescence.
Origin of opalescent:
iridescent, nacreous, opalescent, opaline, pearlescent(adj)
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"
Exhibiting a milky iridescence like that of an opal.
Origin: From . First attested in 1813.