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English definition of “mother-of-pearl”

mother-of-pearl

noun [U]     /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.JewelleryThe skin, hair and bone of non-human animals
(Definition of mother-of-pearl noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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