sourdough

sourdough
    n 1: a leaven of dough in which fermentation is active; used by
         pioneers for making bread
    2: a settler or prospector (especially in western United States
       or northwest Canada and Alaska)
    

28 Moby Thesaurus words for "sourdough":
      acid, acidulant, bread-and-butter pickle, butty, chokecherry,
      collier, crab apple, desert rat, dill pickle, driller, gold digger,
      gold miner, gold panner, green apple, lemon, lime, miner,
      mineworker, pickle, prospector, sour, sour balls, sour cream,
      sour grapes, sour pickle, verjuice, vinegar, yogurt