Pandæmonium comprises the Greek words pan, "all", and daimonion, "demon"; it can roughly be translated as "all demons". Pandæmonium is the castle of Lucifer and the capital of Hell in John Milton's Paradise Lost, and the word was invented by him. The word has also come to mean any wild disorder or chaos in English.
Usage
See Special:Whatlinkshere/Etymology:Pandaemonium for a list of articles using this term.