[chi.ton] n [NL, genus name, fr. Gk chiton tunic, of Sem origin; akin to Heb kuttoneth tunic] (1816) 1: any of a class (Polyplacophora) of elongated bilaterally symmetrical marine mollusks with a dorsal shell of calcareous plates
2: the basic garment of ancient Greece worn usu. knee-length by men and full-length by women