GNU Collaborative International Dictionary of English

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1.       
   Exoskeleton , n. [Exo- + skeleton] (Anat.) The hardened parts of the external integument of an animal, including hair, feathers, nails, horns, scales, etc.,as well as the armor of armadillos and many reptiles, and the shells or hardened integument of numerous invertebrates; external skeleton; dermoskeleton.
   1913 Webster