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Definition of COCOON
a: an envelope often largely of silk which an insect larva forms about itself and in which it passes the pupa stage
b: any of various other protective coverings produced by animals
a: something suggesting a cocoon especially in providing protection or in producing isolation <wrapped in a cocoon of blankets><an interest in the world beyond the everyday cocoon most of us construct — Peter Mayle>
b: a protective covering placed or sprayed over military or naval equipment in storage