1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Mosasauria  \Mos`a*sau"ri*a\,  n.  pl  [NL.  See  {Mosasaurus}.] 
  (Paleon.) 
  An  order  of  large  extinct,  marine  reptiles,  found  in  the 
  Cretaceous  rocks,  especially  in  America.  They  were 
  serpentlike  in  form  and  in  having  loosely  articulated  and 
  dilatable  jaws,  with  large  recurved  tteth,  but  they  had 
  paddlelike  feet.  Some  of  them  were  over  fifty  feet  long.  They 
  are  essentially,  fossil  sea  serpents  with  paddles.  Called 
  also  {Pythonomarpha},  and  {Mosasauria}. 

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