| NOUN | substance | mother-of-pearl, nacre | the iridescent internal layer of a mollusk shell |
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| Meaning | The iridescent internal layer of a mollusk shell. | |
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| Synonym | nacre | |
| Broader | shell | The material that forms the hard outer covering of many animals |
| Spanish | madreperla, nácar | |
| Catalan | nacre | |
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