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exoskeleton (n.)

in zoology, "any hardened external structure," as the shells of crustaceans or the scales and plates of fishes and reptiles, especially when it is of the nature of bone, 1841, from exo- + skeleton. Said to have been introduced by English anatomist Richard Owen. Related: Exoskeletal.

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Definitions of exoskeleton

exoskeleton (n.)
the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs;
From wordnet.princeton.edu