Where does “τύλος” come from?

τύλος (Ancient Greek) comes from Ancient Greek τύλη, 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.

τύλος (Ancient Greek): callus, knot; callus; knot; knob; trenail; torus,...