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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Gnathostoma  \Gna*thos"to*ma\,  n.  pl  [NL.,  from  Gr  ?  the  jaw  + 
  ?,  ?,  the  mouth.]  (Zo["o]l.) 
  A  comprehensive  division  of  vertebrates,  including  all  that 
  have  distinct  jaws,  in  contrast  with  the  leptocardians  and 
  marsipobranchs  (Cyclostoma),  which  lack  them  [Written  also