The Collaborative International Dictionary of English v.0.48:

Laborer \La"bor*er\, n. [Written also labourer.]
   One who labors in a toilsome occupation; a person who does
   work that requires strength rather than skill, as
   distinguished from that of an artisan.
   [1913 Webster]

WordNet (r) 3.0 (2006):

laborer
    n 1: someone who works with their hands; someone engaged in
         manual labor [syn: laborer, manual laborer, labourer,
         jack]