Definition of mother-of-pearl noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌmʌðər əv ˈpɜːl//
; NAmE NAmE//ˌmʌðər əv ˈpɜːrl//
(also pearl) [uncountable]
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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 the Oxford Advanced American Dictionary entry: mother-of-pearl