LancelotPronunciation: /ˈlɑːnsələt, -lɒt/ (also Launcelot /ˈlɔːn-/)Definition of Lancelot (in Arthurian legend) the most famous of Arthur’s knights, lover of Queen Guinevere and father of Galahad. Lancelot in other Oxford dictionaries Definition of Lancelot in the US English dictionary