quadriremis

For example, a rock drawing of a Roman warship, likely done by a swab, was labeled navis tetraris longa, using Greek tetraris, "4-er," rather than quadriremis.

The Female Royal Line: matrilineal succession amongst the Picts? Carla 2008

The ships of war received their name from the number of banks of oars, one above another, which they contained: thus a ship with three banks of oars was called _triremis_, one with four, _quadriremis_, &c.; in these, sails were not used.

Roman Antiquities, and Ancient Mythology For Classical Schools (2nd ed) Charles K. Dillaway