Lewis & Short

dĕcēris, is, f., = δεκήρης (sc. ναῦς), a ten-oared ship, i. e. a ship having ten banks of oars: Liburnicas, Suet. Calig. 37 (acc. to a conject. of Turneb. Adv. 22, 30; lect. vulg. de cedris).