The Collaborative International Dictionary of English v.0.48:

Crowbar \Crow"bar`\ (kr?"b?r), n.
   A bar of iron sharpened at one end, and used as a lever.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crowbar
    n 1: a heavy iron lever with one end forged into a wedge [syn:
         crowbar, wrecking bar, pry, pry bar]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "crowbar":
   aspirator, bar, beam, boom, cant hook, claw bar, corkscrew, crank,
   crow, extractor, forceps, get a foothold, get leverage, handspike,
   iron crow, jimmy, lever, limb, marlinespike, outrigger, peavey,
   pedal, pincers, pinch bar, pipette, pliers, press, prize, pry,
   pump, ripping bar, separator, siphon, spar, treadle, tweezers,
   vacuum pump, wedge, wrecking bar, wringer