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cocoon

noun [C] (COVER)
 
 
/kəˈkuːn/

Definition

the covering made of soft smooth threads that surrounds and protects particular insects during the pupa stage as they develop into adult formThe skin, hair and bone of non-human animalsThe development and parts of insects
(Definition of cocoon noun (COVER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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