nacre Meaning, Definition & Usage

  1. noun the iridescent internal layer of a mollusk shell
    mother-of-pearl.

WordNet

Na"cre noun
Etymology
F., cf. Sp. nácara, nácar, It. nacchera, naccaro, LL. nacara, nacrum; of Oriental origin, cf. Ar. nakir hollowed.
Definitions
  1. (Zoöl.) A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. Written also nacker and naker. See Pearl, and Mother-of-pearl.

Webster 1913