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- DictionaryMoth·er-of-pearl/ˌməðər əv ˈpərl/
noun
- 1. a smooth shining iridescent substance forming the inner layer of the shell of some mollusks, especially oysters and abalones, used in ornamentation: "mother-of-pearl buttons"
noun
Nacre ( NAY-kər, NAK-rə), also known as mother of pearl, is an organic–inorganic composite material produced by some molluscs as an inner shell layer. It is also the material of which pearls are composed. It is strong, resilient, and iridescent. Nacre is found in some of the most ancient lineages of bivalves, gastropods, and cephalopods. Wikipedia