Hypertext Webster Gateway: "exoskeleton"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
exoskeleton
n : the exterior protective or supporting structure or shell of
many animals (especially invertebrates) including bony or
horny parts such as nails or scales or hoofs
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