Dicrotum, dícroti, n. g pen. cor. Cicer.A galley that hath two oares in a seate.
Lewis and Short: Latin dictionary
dicrŏtum, i, n. (sc. navigium), = di/krotos (two-oared), a galley with two banks of oars, Cic. Att. 5, 11, 4; 16, 4fin.—Also called dicrŏta, ae, f. (sc. navis), Auct. B. Alex. 47, 2.