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The cast-off skins or coverings of various organisms, such as the shells of crabs or the external coverings of the larvae and nymphs of insects.
ex·u′vi·al (-vē-əl) adj.
pl n, sing exuvia (-vɪə)
(Zoology) layers of skin or cuticle shed by animals during ecdysis
[C17: from Latin: things stripped off (the body), from exuere to strip off]