American English

Definition of mother-of-pearl noun from the Oxford Advanced American Dictionary

 

mother-of-pearl

 noun
noun
 
(also pearl) [uncountable]
 
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the hard, smooth, shiny substance in various colors 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 Learner's Dictionary entry: mother-of-pearl