Gna·thos·to·ma /nəˈθɑstəmə/ 名詞
  Gna·thos·to·ma n. pl.  Zool. A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them. [Written also Gnathostomata.]
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