noun moth·er–of–pearl \ˌmə-thə-rə(v)-ˈpər(-ə)l\

: 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)

Full Definition of MOTHER-OF-PEARL

:  the hard pearly iridescent substance forming the inner layer of a mollusk shell

First Known Use of MOTHER-OF-PEARL

circa 1510


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