Barbarossa2 Syllabification: (Bar·ba·ros·sa)Pronunciation: /ˌbärbəˈräsə/Definition of Barbarossa (circa 1483–1546), Barbary pirate; born Khair ad-Din. He was notorious for his successes against Christian vessels in the eastern Mediterranean Sea. Barbarossa in other Oxford dictionaries Definition of Barbarossa in the British & World English dictionary