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 ]
n. The process of becoming chitinous. [ 1913 Webster ]
a. Having the nature of chitin; consisting of, or containing, chitin. [ 1913 Webster ]