Definition of masts:
(n) :
(nautical, communication, aviation) A tall, slim post or tower, usually tapering upward, used to support, for example, sails or observation platforms on a ship, the main rotor of a helicopter, flags, floodlights, meteorological instruments, or communications equipment, such as an aerial, usually supported by guy-wires (except in the case of a helicopter).
(v) :
To supply and fit a mast to (a ship).
(n) :
The fruit of forest-trees (beech, oak, chestnut, pecan, etc.), especially if having fallen from the tree, used as fodder for pigs and other animals.
(v) :
(of swine and other animals) To feed on forest seed or fruit.
(v) :
(agriculture, forestry, ecology, of a population of plants) To produce a very large quantity of fruit or seed in certain years but not others.
(n) :
(naval) A non-judicial punishment ("NJP"); a disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.