antitheton

antĭthĕton, i, n., = ἀντίθετον,

• opposition, antithesis, a rhetor. fig., Cic. Or. 50, 166; Pers. 1, 85 (e. g. frigida pugnabant calidis, humentia siccis, Ov. M. 1, 19; cf. Quint. 9, 3, 81).