Hypertext Webster Gateway: "chitin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Chitin \Chi"tin\, n. [See {Chiton}.] (Chem.)
A white amorphous horny substance forming the harder part of
the outer integument of insects, crustacea, and various other
invertebrates; entomolin.
From WordNet (r) 1.7 (wn)
chitin
n : a tough semitransparent horny substance; the principal
component of the exoskeletons of arthropods and the cell
walls of certain fungi
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