Where does “πηδάλιο” come from?

πηδάλιο (Greek) comes from Ancient Greek πηδάλιον, from Ancient Greek πηδόν, from Ancient Greek πούς, from Proto-Indo-European pṓds, from Proto-Indo-European póds, from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.

πηδάλιο (Greek): rudder, helm; A part of a watch used to control...