GawainPronunciation: /ˈgɑːweɪn, gəˈweɪn/Definition of Gawain (in Arthurian legend) one of the knights of the Round Table who quested after the Holy Grail. He is the hero of the medieval poem Sir Gawain and the Green Knight. Gawain in other Oxford dictionaries Definition of Gawain in the US English dictionary