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Exoskeleton
Exoskeleton Ex`o*skel"e*ton, 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.
Meaning of exoskeleton from wikipedia
