1590–1600; < Medieval Latin nacrum, nacer, variant of nacara < Old Italian naccara kind of drum, nacre < Arabic naqqārah drum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nacre (ˈneɪkə)
the technical name for mother-of-pearl
[C16: via French from Old Italian naccara, from Arabic naqqārah shell, drum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1598, "type of shellfish that yields mother-of-pearl," from M.Fr., from It. naccaro (now nacchera), possibly ult. from Arabic nakara "to hollow out," in ref. to the shape of the mollusk shell. Meaning "mother-of-pearl" is from 1718.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
nacre   (nā'kər)  Pronunciation Key 
See mother-of-pearl.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When an intruder bores into the oyster shell, the oyster reacts by covering it
  with nacre, producing a pearl.
In particular, they've looked to the porous but resilient material called nacre
  that lines abalone shells.
Many biological materials use the same trick to increase their strength,
  materials such as bone, teeth and nacre.
To reduce irritation, it is coated with nacre, the same secretion the animal
  uses to grow its shell.
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