nacre

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nacre:

see mother-of-pearlmother-of-pearl
or nacre
, the iridescent substance that forms the lining of the shells of some fresh-water and some salt-water mollusks. Like the pearl it is a secretion of the mantle, composed of alternate layers of calcium carbonate and conchiolin.
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nacre

[′nā·kər]
(invertebrate zoology)
An iridescent inner layer of many mollusk shells.