The Collaborative International Dictionary of English v.0.48:

Workman \Work"man\, n.; pl. Workmen. [AS. weorcmann.]
   [1913 Webster]
   1. A man employed in labor, whether in tillage or
      manufactures; a worker.
      [1913 Webster]

   2. Hence, especially, a skillful artificer or laborer.
      [1913 Webster]

WordNet (r) 3.0 (2006):

workman
    n 1: an employee who performs manual or industrial labor [syn:
         workman, workingman, working man, working person]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "workman":
   blue-collar worker, breadwinner, casual, casual laborer,
   common laborer, day laborer, employee, factory worker, flunky,
   free lance, free-lancer, full-time worker, hand, industrial worker,
   jobber, jobholder, laborer, laboring man, menial, migrant, moiler,
   navvy, office temporary, operative, proletarian, roustabout,
   salaried worker, self-employed person, servant, stiff, temporary,
   toiler, wage earner, wage slave, wageworker, worker, workgirl,
   workhand, working girl, workingman, workingwoman



Bouvier's Law Dictionary, Revised 6th Ed (1856):

WORKMAN. One who labors, one who is employed to do business for another.
     2. The obligations of a workman are to perform the work he has
undertaken to do; to do it in proper time; to do it well to employ the
things furnished him according to his contract.
     3. His rights, are to be paid what his work is worth, or what it
deserves; to have all the facilities which the employer can give him for
doing his work. 1 Bouv. Just. n. 1000 to 1006.