n. [ F. galéasse, galéace; cf. It. galeazza, Sp. galeaza; LL. galea a galley. See Galley. ] (Naut.) 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. [ Written variously galeas, gallias, etc. ] [ 1913 Webster ]

☞ “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.