mast

noun5

1. •
   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).
2. •
   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.

   • She shut them straight in sties; and gaue them meate / Oke-mast, and beech, and Cornell fruite, they eate, […] — 1614
3. •
   A non-judicial punishment ("NJP"); a disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.
4. •
   (slang) The anabolic steroid drostanolone propionate, also known as Masteron
5. •
   (no longer used) A type of heavy cue, with the broad end of which one strikes the ball.

verb3

1. •
   To produce a very large quantity of fruit or seed in certain years but not others.

   • Any individual tree which masted in a generally non-mast year would be subjected to the exclusive attention of the seed predators and so would be selected against. — 1985
2. •
   To supply and fit a mast to (a ship).
3. •
   To feed on forest seed or fruit.

noun1

1. •
   Initialism of military antishock trousers; inflatable trousers that apply pressure to the inferior half of a patient's body to decrease blood loss and prevent the onset of shock, similar to a tourniquet.