traitor
trai.tor \'tra-t-*r\ \'tra--tr*s, 'tra-t-*-r*s\ n [ME traitre, fr. OF, fr. L traditor, fr. traditus, pp. of ]tradere to hand over, deliver, betray, fr. trans-, tra- trans- + dare to give - more at DATE 1: one who betrays another's trust or is false to an obligation or duty 2: one who commits treason - trai.tress n