Nacre
Pronunciation : Na"cre
Part of Speech : n.
Etymology : [F., cf. Sp. n?cara, n?car, It. nacchera, naccaro, LL. nacara, nacrum; of Oriental origin, cf. Ar. nakir hollowed.] (Zo?l.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913