Search Result for "chitin": 
Wordnet 3.0

NOUN (1)

1. a tough semitransparent horny substance; the principal component of the exoskeletons of arthropods and the cell walls of certain fungi; 



The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]


WordNet (r) 3.0 (2006):

chitin
    n 1: a tough semitransparent horny substance; the principal
         component of the exoskeletons of arthropods and the cell
         walls of certain fungi