An Etymological Dictionary of Astronomy and Astrophysics

The bottom or under surface of the → foot.

Etymology (EN): M.E., from O.Fr., from L. solea “sandal, bottom of a shoe,” from solum “base, bottom, ground,” of unknown origin.

Etymology (PE): From kaf, “the sole of the foot; the palm of the hand,” → floor; pâ, → foot.