Găl'le-ass, n.

n. [See GALLIASS.] (Naut.) A vessel formerly used by the Spaniards, of large size and weight, combining the features of a galleon and a 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.” Motley.