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Từ điển Oxford Advanced Learner 8th
mother-of-pearl
ˌmother-of-ˈpearl [mother-of-pearl] BrE NAmE (also pearl) noun uncountable
the hard smooth shiny substance in various colours that forms a layer inside the shells of some types of ↑shellfish and is used in making buttons, decorative objects, etc.
See also: ↑pearl
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