from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Adapted for walking or having limbs adapted for walking. Used of flightless birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Adapted for walking.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Adapted for walking; anisodactylous; as the feet of certain birds and insects. See Illust. under aves.

from The Century Dictionary and Cyclopedia

  • In zoology, adapted for walking; formed for or having the habit of walking; ambulatory; specifically, in entomology, of or pertaining to the Gressoria: as, gressorial feet; gressorial birds; gressorial insects.


From New Latin gressōrius, from Latin gressus, step, from past participle of gradī, to walk.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin gressus, past participle of gradior ("I walk") + -or +‎ -ial (Wiktionary)


  • Despite his attempts at self-taught flight, he remains gressorial and speaks to himself and other animals in Jesse Eisenberg's stop-and-go whine. Top Stories


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