{ 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.