Of, relating to, or characteristic of Bacchus or bacchic revelry; involving wild drunken celebration.
From bacchic plus the suffix -al, creating the adjective form; ultimately derived from Latin bacchicus and Greek Bakchos.
The -al suffix turns almost any word into an adjective, which is why you can have 'bacchic' and 'bacchical' meaning nearly the same thing—English lets you build related words like LEGO blocks.
Complete word intelligence in one call. Free tier — 50 lookups/day.