| n. | 1. | (Zool.) A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. |
| a. | 1. | (Art) Having the peculiar iridescence of nacre, or mother-of-pearl, or an iridescence resembling it; |
| Noun | 1. | nacre - the iridescent internal layer of a mollusk shell Synonyms: mother-of-pearl |