pearlescent

from WordNet (r) 3.0 (2006)

pearlescent
    adj 1: 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}]

from The Collaborative International Dictionary of English v.0.48

pearlescent \pearl*es"cent\ (p[~e]r*l[e^]s"ent) adj.
   1. Having an iridescent pearl-like surface, giving a play of
      lustrous rainbowlike colors; nacreous; pearlaceous.

   Syn: iridescent, nacreous, opalescent, opaline, pearlaceous.
        [WordNet 1.5]

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