pandemoniac

adjective
pan·de·mo·ni·ac | \ ¦pandə¦mōnēˌak \
variants: or less commonly pandemonic \-mänik \ or pandemoniacal \¦pandəmə¦nīəkəl \

Definition of pandemoniac 

1 : of or relating to or resembling Pandemonium : infernal

2 : having the character of a pandemonium : riotous several hundred thousand hysterical … youths roaring pandemoniac approval —J. A. Morris, born 1904

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History and Etymology for pandemoniac

pandemonium + -ac (after demoniac) or -ic (after demonic) or -acal (after demoniacal)

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