Longman Dictionary English From Longman Dictionary of Contemporary EnglishArthurAr‧thur /ˈɑːθə $ ˈɑːrθər/ in old stories, a king of Britain → Arthurian Legend —Arthurian /ɑːˈθjʊəriən $ ɑːrˈθʊr-/ adjective ldoceonline.com