The Collaborative International Dictionary of English v.0.48:

Breadwinner \Bread"win`ner\ (br[e^]d"w[i^]n`n[~e]r), n.
   The member of a family whose labor supplies the food of the
   family; one who works for his living. --H. Spencer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

breadwinner
    n 1: one whose earnings are the primary source of support for
         their dependents

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "breadwinner":
   blue-collar worker, 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, proletarian, roustabout, salaried worker,
   self-employed person, servant, stiff, temporary, toiler,
   wage earner, wage slave, wageworker, worker, workgirl, workhand,
   working girl, workingman, workingwoman, workman