(Science: zoology) A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl.

Alternative forms: nacker and naker] See pearl, and mother-of-pearl.

Origin: F, cf. Sp. Nacara, nacar, It. Nacchera, naccaro, LL. Nacara, nacrum; of Oriental origin, cf. Ar. Nakir hollowed.

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