"a beating with a cudgel" (especially on the soles of the feet, as torture or punishment), 1570s, from Spanish bastonada "a beating, cudgeling," from baston "stick," from Late Latin bastum (see baton). As a verb from 1610s.
bastardize
bastardy
baste
baster
Bastille
bastinado
bastion
bat
Bat Mitzvah
Batavia
batboy