exoskeleton

[ek-soh-skel-i-tn]
noun Zoology.
an external covering or integument, especially when hard, as the shells of crustaceans (opposed to endoskeleton ).

Origin:
1840–50; exo- + skeleton

exoskeletal, adjective
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World English Dictionary
exoskeleton (ˌɛksəʊˈskɛlɪtən)
 
n
Compare endoskeleton the protective or supporting structure covering the outside of the body of many animals, such as the thick cuticle of arthropods
 
exo'skeletal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

exoskeleton
1847, from exo- + skeleton. Introduced by Eng. anatomist Sir Richard Owen (1804-1892).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exoskeleton ex·o·skel·e·ton (ěk'sō-skěl'ĭ-tn)
n.

  1. All hard parts, such as hair, teeth, and nails, that develop from the ectoderm or mesoderm in vertebrates.

  2. A hard outer structure, such as the shell of an insect, that provides protection or support for an organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
exoskeleton   (ěk'sō-skěl'ĭ-tn)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for exoskeletons
It is found in arthropod exoskeletons and in the cell walls of some fungi.
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