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From The Collaborative International Dictionary of English v.0.48:
Galleon \Gal"le*on\, n. [Sp. galeon, cf. F. galion; fr. LL. galeo, galio. See Galley.] (Naut.) A sailing vessel of the 15th and following centuries, often having three or four decks, and used for war or commerce. The term is often rather indiscriminately applied to any large sailing vessel. [1913 Webster] The galleons . . . were huge, round-stemmed, clumsy vessels, with bulwarks three or four feet thick, and built up at stem and stern, like castles. --Motley. [1913 Webster]