NOUN (4)

1. a vertical spar for supporting sails;

2. nuts of forest trees (as beechnuts and acorns) accumulated on the ground;

3. nuts of forest trees used as feed for swine;

4. any sturdy upright pole;

The Collaborative International Dictionary of English v.0.48:

Mast \Mast\ (m[.a]st), n. [AS. maest, fem.; akin to G. mast, and
   E. meat. See Meat.]
   The fruit of the oak and beech, or other forest trees; nuts;
   acorns.
   [1913 Webster]

         Oak mast, and beech, . . . they eat.     --Chapman.
   [1913 Webster]

         Swine under an oak filling themselves with the mast.
                                                  --South.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mast \Mast\, v. t. [imp. & p. p. Masted; p. pr. & vb. n.
   Masting.]
   To furnish with a mast or masts; to put the masts of in
   position; as, to mast a ship.
   [1913 Webster] Mastaba

The Collaborative International Dictionary of English v.0.48:

Mast \Mast\, n. [AS. maest, masc.; akin to D., G., Dan., & Sw.
   mast, Icel. mastr, and perh. to L. malus.]
   [1913 Webster]
   1. (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.
      [1913 Webster]

            The tallest pine
            Hewn on Norwegian hills, to be the mast
            Of some great ammiral.                --Milton.
      [1913 Webster]

   Note: The most common general names of masts are foremast,
         mainmast, and mizzenmast, each of which may be made
         of separate spars.
         [1913 Webster]

   2. (Mach.) The vertical post of a derrick or crane.
      [1913 Webster]

   3. (Aeronautics) A spar or strut to which tie wires or guys
      are attached for stiffening purposes.
      [Webster 1913 Suppl.]

   Afore the mast, Before the mast. See under Afore, and
      Before.

   Mast coat. See under Coat.

   Mast hoop, one of a number of hoops attached to the fore
      edge of a boom sail, which slip on the mast as the sail is
      raised or lowered; also, one of the iron hoops used in
      making a made mast. See Made.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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