What is the meaning of the word "nacre"?

Definitions:

  1. A hard, iridescent substance that forms the inner layer of some mollusk shells. copy to clipboard NOUN
    • They make a many-chambered spiral shell with its inner surface lined with beautiful pearly 'nacre'. copy to clipboard
  2. A smooth, hard substance forming a layer inside the shells of some sea creatures. It is white but also seems to shine with different colors, and is used to make buttons and for decoration. copy to clipboard NOUN
    • Under a microscope, 'nacre' looks like a well-build brick wall with overlapping platelets of different lengths held together by thin layers of an elastic biopolymer. copy to clipboard

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