n. & adj.
n. 1 a wild and drunken revelry. 2 a drunken reveller. 3 a priest, worshipper, or follower of Bacchus.
adj. 1 of or like Bacchus, the Greek or Roman god of wine, or his rites. 2 riotous, roistering.
[ L bacchanalis f. Bacchus god of wine f. Gk Bakkhos ]