Oxford Dictionary English madhouse noun noun BrE BrE//ˈmædhaʊs// ; NAmE NAmE//ˈmædhaʊs// Add to my wordlistjump to other results1[usually singular] (informal) a place where there is confusion and noise Don't work in that department; it's a madhouse.2(old use) a hospital for people who are mentally illSee madhouse in the Oxford Advanced American DictionaryCheck pronunciation: madhouse oxfordlearnersdictionaries.com