Galleass

Galleass (?; 135) , noun

[French galéasse, galéace; compare Italian galeazza, Sp. galeaza; Late Latin galea a galley. See Galley.]

(Nautical) A large galley, having some features of the galleon, as broadside guns; esp., such a vessel used by the southern nations of Europe in the 16th and 17th centuries. See Galleon, and Galley.

“The galleasses... were a third larger than the ordinary galley, and rowed each by three hundred galley slaves. They consisted of an enormous towering structure at the stern, a castellated structure almost equally massive in front, with seats for the rowers amidships.”