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English definition of “mother-of-pearl”

mother-of-pearl

noun [U] uk   /ˌmʌð.ə.rəvˈpɜːl/ us    /-ɚ.əvˈpɝːl/
a smooth, hard substance forming a layer inside the shells of some sea creatures. It is white but also seems to shine with different colours, and is used to make buttons and for decoration.
(Definition of mother-of-pearl from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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