01 n. pl. Cast skins, shells, or coverings of animals; any parts of animals which are shed or cast off, as the skins of snakes, the shells of lobster…
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1.
Cast skins, shells, or coverings of animals; any parts of animals which are shed or cast off, as the skins of snakes, the shells of lobsters, etc.(Zoöl.)
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2.
The fossil shells and other remains which animals have left in the strata of the earth.(Geol.)