mast

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Nautical A tall vertical spar, sometimes sectioned, that rises from the keel or deck of a sailing vessel to support the sails and the standing and running rigging.
2. n. A vertical pole.
3. n. A tall vertical antenna, as for a radio.
4. n. A captain's mast.
5. n. The nuts of forest trees accumulated on the ground, used especially as food for swine.

Century Dictionary and Cyclopedia

1. n. A pole or pillar of round timber, or of tubular iron or steel, secured at the lower end to the keel of a vessel, and rising into the air above the deck to support the yards, sails, and rigging in general. A mast is composed either of a single piece, or of several pieces united by iron bands. When it is of several pieces, it is called a built mast or a made mast. In all large vessels the masts are composed of several lengths, called lower mast, topmast, and topgallantmast. The royalmast is now made in one piece with the topgallantmast. A mast consisting of a single length is called a pole-mast. In a full-rigged ship with three masts, each of three pieces, the masts are distinguished as the foremast, the mainmast, and the mizzenmast; and the pieces as the foremast(proper), foretopmast, foretopgallantmast, etc. In vessels with two masts, they are called the foremast and mainmast; in vessels with four masts, the aftermast is called the spanker-mast or jigger-mast.
2. n. Any tall pole.
3. n. The main upright member of a derrick or crane, against which the boom abuts.
4. To fix a mast or masts in; supply with a mast or masts; erect the masts of: as, to mast a ship.
5. n. The fruit of the oak and beech or other forest-trees; acorns or nuts collectively, serving as food for animals.
6. To feed on mast.

Wiktionary

1. 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.
2. v. To feed on forest seed or fruit.
3. v. agriculture, forestry, ecology To vary fruit and seed production in multi-year cycles.
4. n. A tall, slim post or tower, usually tapering upward, used to support, for examples, the sails on a ship, flags, floodlights, or communications equipment such as an aerial, usually supported by guy-wires.
5. v. To supply and fit a mast to a ship

GNU Webster's 1913

1. n. The fruit of the oak and beech, or other forest trees; nuts; acorns.
2. n. (Naut.) A pole, or long, strong, round piece of timber, or spar, set upright in a boat or vessel, to sustain the sails, yards, rigging, etc. A mast may also consist of several pieces of timber united by iron bands, or of a hollow pillar of iron or steel.
3. n. (Mach.) The vertical post of a derrick or crane.
4. n. (Aëronautics) A spar or strut to which tie wires or guys are attached for stiffening purposes.
5. v. To furnish with a mast or masts; to put the masts of in position.

WordNet 3.0

1. n. any sturdy upright pole
2. n. nuts of forest trees used as feed for swine
3. n. nuts of forest trees (as beechnuts and acorns) accumulated on the ground
4. n. a vertical spar for supporting sails