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endoskeleton vs. exoskeleton

[ en-doh-skel-i-tn ]
noun
  1. the internal skeleton or framework of the body of an animal (opposed to exoskeleton).
[ ek-soh-skel-i-tn ]
noun
  1. an external covering or integument, especially when hard, as the shells of crustaceans (opposed to endoskeleton).