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)