Oxford Dictionary English scarlet fever nounnoun BrE BrE//ˌskɑːlət ˈfiːvə(r)// ; NAmE NAmE//ˌskɑːrlət ˈfiːvər// [uncountable] Add to my wordlistjump to other results a serious infectious disease that causes fever and red marks on the skinSee scarlet fever in the Oxford Advanced American DictionaryCheck pronunciation: scarlet fever oxfordlearnersdictionaries.com