(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).

(naval) A non-judicial punishment ("NJP"); a disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.

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.

(bodybuilding slang) The anabolic steroid Drostanolone propionate, also known as Masteron

To supply and fit a mast to (a ship).

(of swine and other animals) To feed on forest seed or fruit.

(agriculture, forestry, ecology, of a population of plants) To produce a very large quantity of fruit or seed in certain years but not others.