Dictionary entry

Gressorial

Webster's Dictionary 1913

{ Gres‐so″ri‐al (?), 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.