asmooth, hardsubstanceformingalayerinside theshellsof someseacreatures. It iswhitebut alsoseemstoshinewith differentcolours, and is used to makebuttonsand fordecoration.
珠母层，珍珠母
Synonym
mother-of-pearl
Daniel Sambraus/Photographer's Choice RF/GettyImages
SMART Vocabulary: related words and phrases
Jewelry
ankle bracelet
anklet
bauble
be dripping withsomethingidiom
butterfly
cameo
circlet
clip-on
cuff
drip
earring
finery
jewelled
jewellery
jewellery box
pendant
rhinestone
sleeper
sparkler
treasure
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The oblique aperture is rounded-oval, with a very thin layer of bluish iridescentnacrewithin.
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The mussel'snacreis typically white or bluish, and the shell in general is rounded and generally symmetrical over the axis.
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Most molluscs with shells can produce pearls, but only the pearls of bivalves and some gastropods, whose shells are lined withnacre, are valuable.
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For example, the organic component innacreis known to restrict the growth of aragonite.
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Multilayer stacks (laminates) have a structure similar tonacre, which provides mechanical strength at water free conditions.
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The acute outer lip is narrowly margined, iridescent within, thenacresmooth, but apparently lirate.
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Some are fine examples of inlay work withnacreand ivory.
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The colour is yellowish chalky white over brilliantnacre.
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The oysters release of thenacreserves as an adaptation of the immune system to isolate the invasive particle and irritation.
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Thenacreof the shell is blue, sometimes with pink areas.
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Nacretesserae may be cut into shapes and laminated to a ceramic tile or marble base.
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These white areas - especially on the pedipalps - have anacre-like iridescence.
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In response, the mantle tissue of the mollusk secretesnacreinto the pearl sac, a cyst that forms during the healing process.
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It is lined with iridescent greennacrewith red reflections.
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Thenacreis mostly translucent with a salmon pink area.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
This example is from Wikipedia and may be reused under a CC BY-SA license.