1. 
   gressorious
   <ornithology, zoology> Adapted for walking; anisodactylous; as the feet of certain birds and insects. ... Origin: L. Gressus, p. P. Of gradi to step, go. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?gressorious
   
   
2. 
   Gressorious
   • (a.) Adapted for walking; anisodactylous; as the feet of certain birds and insects. See Illust. under Aves.
   Found op http://thinkexist.com/dictionary/meaning/gressorious/
   
   

Tip: double click on a word to show its meaning.