Source : Webster's Revised Unabridged Dictionary (1913)

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.

Masting \Mast"ing\, n. (Naut.)
   The act or process of putting a mast or masts into a vessel;
   also, the scientific principles which determine the position
   of masts, and the mechanical methods of placing them.

   {Masting house} (Naut.), a large building, with suitable
      mechanism overhanging the water, used for stepping and
      unstepping the masts of vessels.