gressorial

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gressorial

(ɡrɛˈsɔːrɪəl) or

gressorious

adj
1. (Zoology) (of the feet of certain birds) specialized for walking
2. (Zoology) (of birds, such as the ostrich) having such feet
[C19: from New Latin gressōrius, from gressus having walked, from gradī to step]