Lewis & Short

sŏphisma, ătis, n., = σόφισμα, a false conclusion, fallacy, sophism (pure Lat. captio), Sen. Ep. 45, 8; Gell. 18, 13, 2 (in Cic. Ac. 2, 24, 75, written as Greek, and explained by fallaces conclusiunculae; cf. also Sen. Ep. 111, 1).