Lewis & Short

pseudŏmĕnos or -us, i, m., = ψευδόμενος; in logic, a false, sophistical species of syllogism, Cic. Ac. 2, 48, 147; id. Fragm. ap. Non. 329, 19 (as Greek, Cic. Div. 2, 4, 11; Sen. Ep. 45, 10).