pan·de·mo·ni·ac \|pandə|mōnēˌak\adjective alsopan·de·mon·ic\-mänik\; orpan·de·mo·ni·a·cal\|pandəmə|nīəkəl\ Etymology:pandemonium + -ac (after demoniac) or -ic (after demonic) or -acal (after demoniacal) 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 b. 1904 >