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hard outer covering or case of certain organisms such as arthropods and turtles
the outer body wall of an insect
large bony or horny plate as on an armadillo or turtle or the underside of a snake
the outer layer of the skin covering the exterior body surface of vertebrates
(zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell
one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
the dead skin at the base of a fingernail or toenail
a natural protective body covering and site of the sense of touch
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