1560s, "characterized by intemperate drinking;" see Bacchanalia + -an. From 1620s as "pertaining to Bacchanals." As a noun from 1610s, "participant in the Bacchanalia."
a night of bacchanalian revelry
baccalaureate
baccarat
Bacchae
Bacchanal
Bacchanalia
Bacchanalian
Bacchus
bach
bachelor
bachelorette
bacilli
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