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Meaning of galleass

gal•le•ass

Pronunciation: (gal'ē-as"), [key]
— n. Naut.
  1. a fighting galley, lateen-rigged on three masts, used in the Mediterranean Sea from the 15th to the 18th centuries.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.