Capable of walking or moving by walking; able to walk.
From Latin 'gressus' (a step, walking) + -ible (capable of), where 'gressus' comes from 'gredi' (to go/walk).
Gressible is practically obsolete, but it belongs to a whole family of motion words from Latin 'gradi'—impressive, progress, regression—all built on the root for walking.
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