"projection from a rampart," 1560s, from Middle French bastillon, diminutive of Old French bastille "fortress, tower, fortified building," from Old Provençal bastir "to build," perhaps originally "make with bast" (see baste (v.1)).
the last bastion of communism
a bastion against corruption
bastardy
baste
baster
Bastille
bastinado
bastion
bat
Bat Mitzvah
Batavia
batboy
batch