The Collaborative International Dictionary of English v.0.48:

Draughtsman \Draughts"man\, n.; pl. Draughtsmen.
   1. One who draws pleadings or other writings.
      [1913 Webster]

   2. One who draws plans and sketches of machinery, structures,
      and places; also, more generally, one who makes drawings
      of any kind.
      [1913 Webster]

   3. A "man" or piece used in the game of draughts.
      [1913 Webster]

   4. One who drinks drams; a tippler. [Obs.] --Tatler.
      [1913 Webster]

WordNet (r) 3.0 (2006):

draughtsman
    n 1: a skilled worker who draws plans of buildings or machines
         [syn: draftsman, draughtsman, draftsperson]