Meaning of “opalescent” in the English Dictionary

"opalescent" in British English

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uk /ˌəʊ.pəlˈes.ənt/ us /ˌoʊ.pəlˈes.ənt/ literary

Something that is opalescent reflects light and changes colour like an opal:

the opalescent scales of a fish
noun [ U ] uk /ˌəʊ.pəlˈes.əns/ us /ˌoʊ.pəlˈes.əns/

(Definition of “opalescent” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)