moldboard

noun
mold·board | \ˈmōl(d)-ˌbȯrd \

Definition of moldboard 

1 : a curved iron plate attached above a plowshare to lift and turn the soil

2 : a blade on a machine (such as a bulldozer) that pushes material to one side as the machine advances

First Known Use of moldboard

1508, in the meaning defined at sense 1

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The first known use of moldboard was in 1508

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