crusaderPronunciation: /kruːˈseɪdə/Translate crusader | into German | into Italian Definition of crusader noun 1 (Crusader) a fighter in the medieval Crusades. 2a person who campaigns vigorously for political, social, or religious change; a campaigner:crusaders for early detection and treatment of mental illnessescrusader in other Oxford dictionaries Definition of crusader in the US English dictionary
