[ek-soh-skel-i-tn] /ˌɛk soʊˈskɛl ɪ tn/

noun, Zoology.
an external covering or integument, especially when hard, as the shells of crustaceans (opposed to ).
the protective or supporting structure covering the outside of the body of many animals, such as the thick cuticle of arthropods Compare endoskeleton

1847, from exo- + skeleton. Introduced by English anatomist Sir Richard Owen (1804-1892).

exoskeleton ex·o·skel·e·ton (ěk’sō-skěl’ĭ-tn)

A hard, protective outer body covering of an animal, such as an insect, crustacean, or mollusk. The exoskeletons of insects and crustaceans are largely made of chitin. Compare endoskeleton.


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