Cocoon
/kəˈkun/
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Definition
(noun) The silky case spun by the larvae of some insects in which they metamorphose, protecting the pupa within.
Sentence Examples
I saw a cocoon on the tree.
Caterpillars transform into butterflies while they're in a cocoon.
CEFR Practice Quiz
The caterpillar spun a ____ and then turned into a butterfly.