Webster's English Dictionary

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moldboard

mold.board \'mo-l(d)-.bo-(*)rd, -.bo.(*)rd\ n 1a: a curved iron plate 
   attached above a plowshare to lift and turn the soi l 1b: the flat or 
   curved blade (as of a bulldozer) that pushes material to on e side as the 
   machine advances 2: one of the boards forming a mold for concrete