cultured-pearl

cultured pearl

noun
a pearl induced to form by placement of a grain of sand or another irritating object within the shell of a pearl oyster or mussel.
Also, culture pearl.


Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cultured pearl
 
n
a pearl induced to grow in the shell of an oyster or clam, by the insertion of a small object around which layers of nacre are deposited

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