mother–of–pearl

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mother–of–pearl /ˌmʌðɚrəvˈpɚl/ noun
mother–of–pearl
/ˌmʌðɚrəvˈpɚl/
noun
Learner's definition of MOTHER–OF–PEARL
[noncount]
: a hard, shiny, and smooth substance that is on the insides of the shells of some shellfish (such as mussels) and that is used to decorate objects (such as buttons)