Webster's English Dictionary

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chiton

chi.ton \'ki-t-*n, 'ki--.ta:n\ n [NL, genus name, fr. Gk chito-n tunic; of 
   Sem origin; akin to Heb k] [Gk chito-n]utto-neth tunic 1: any of an order 
   (Polyplacophora) of elongated bilaterally symmetrical ma rine mollusks with 
   a dorsal shell of calcareous plates 2: the basic garment of ancient Greece 
   worn usu. knee-length by men and ful l-length by women