early 14c., "showy trinket or ornament," from Old French baubel "child's toy, trinket," probably a reduplication of bel, from Latin bellus "pretty" (see belle). Or else related to babe, baby. Meaning "a trifle, thing of little or no value" is from 1630s.
battlefield
battlement
battleship
battology
batty
bauble
baud
Bauhaus
baulk
bauxite
Bavaria