a tall upright post, spar, or other structure on a ship or boat, in sailing vessels generally carrying a sail or sails.
Also in the water were strange vessels, with no masts or sails, built of gunmetal-gray metals that seemed impervious to the rust that had afflicted the dock facilities.
(in the US Navy) a session of court presided over by the captain of a ship, especially to hear cases of minor offenses.
It didn't cost him anything, but he had a record of being at Captain's mast and it said, "Appropriate punishment was assigned by the Captain."
the fruit of beech, oak, chestnut, and other forest trees, especially as food for pigs and wild animals.
He explains that the native rats ate many kinds of berries, beech mast , and other wholesome foods of the forest.