Definition of pandemoniac in English:

pandemoniac

adjective

  • Of, relating to, or characteristic of Pandemonium; infernal; (now in extended use) disorderly, raucous, noisy.

noun

  • A disorderly, raucous, or noisy person. rare.

Origin

Late 18th century; earliest use found in Horace Walpole (1717–1797), author, politician, and patron of the arts. From pandemonium + -ac, after demoniac.

Pronunciation

pandemoniac

/ˌpandɪˈməʊnɪak/