Source : Webster's Revised Unabridged Dictionary (1913)

Mast \Mast\, n. [AS. m[ae]st, masc.; akin to D., G., Dan., & Sw.
   mast, Icel. mastr, and perh. to L. malus.]
   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.

            The tallest pine Hewn on Norwegian hills, to be the
            mast Of some great ammiral.

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.

Mast \Mast\, n. [AS. m[ae]st, fem.; akin to G. mast, and E.
   meat. See {Meat}.]
   The fruit of the oak and beech, or other forest trees; nuts;
   acorns.

         Oak mast, and beech, . . . they eat.     --Chapman.

         Swine under an oak filling themselves with the mast.
                                                  --South.

Mast \Mast\, n. (A["e]ronautics)
   A spar or strut to which tie wires or guys are attached for
   stiffening purposes.

Source : WordNet®

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