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o·pal·es·cent

opalescent

 
 
pronunciation:
o p le sihnt
part of speech: adjective
definition 1: exhibiting a spectrum of colors or changing colors like that of an opal; iridescent.
The child was fascinated by the opalescence of the fish's scales.
definition 2: having a milky luster like that of an opal.
derivation: opalescence (n.)