dicrŏtum, i, n. (sc. navigium), = δίκροτος (two-oared),
a galley with two banks of oars , Cic. Att. 5, 11, 4; 16, 4 fin. —Also called dicrŏta , ae, f. (sc. navis), Auct. B. Alex. 47, 2.
dicrotum ī, n , =δίκροτον, a galley with two banks of oars. ...
An Elementary Latin Dictionary