Webster's English Dictionary

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chitin

chi.tin \'ki-t-*n\ \'ki-t-*n-*s, 'ki-t-n*s\ n [F chitine, fr. LN Chiton, 
   genus of mollusks] : an amorphous horny polysaccharide that forms part of 
   the hard outer inte gument of insects, crustaceans, and some other 
   invertebrates - chi.tin.ous aj