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gal·le·assalso gal·li·ass (găl′ē-ăs′, -əs)
A large, fast, heavily armed three-masted Mediterranean galley of the 1500s and 1600s.
[Old French galeasse, from Old Italian galeaza, augmentative of galea, galley, from Old Provençal or Catalan; see galley.]
(Nautical Terms) nautical a three-masted lateen-rigged galley used as a warship in the Mediterranean from the 15th to the 18th centuries
[C16: from French galleasse, from Italian galeazza, from galea galley]
a fighting galley, lateen-rigged on three masts, used in the Mediterranean Sea from the 15th to the 18th centuries.
[1535–45; < Old French galleasse, galiace < Venetian galeaza]