noun.
A large three-masted sailing ship with a square rig and usually two or more decks, used from the 15th to the 17th century especially by Spain as a merchant ship or warship.
The Century Dictionary and Cyclopedia
noun.
A large unwieldy ship, usually having three or four decks and carrying guns, of a kind formerly used by the Spaniards, especially as treasure-ships, in their commerce with South America.
the GNU version of the Collaborative International Dictionary of English
noun.
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.