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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Gressorial  \Gres*so"ri*al\,  Gressorious  \Gres*so"ri*ous\,  a.  [L. 
  gressus  p.  p.  of  gradi  to  step,  go.]  (Zool.) 
  Adapted  for  walking;  anisodactylous;  as  the  feet  of  certain 
  birds  and  insects.  See  Illust.  under  {Aves}.