noun
or mouldboard ˈ ̷ ̷ˌ ̷ ̷
Etymology: mold (I) , mould + board
1.
a. : a curved iron plate attached above a plowshare that lifts and turns the soil — called also breast board
b. : the flat or curved blade (as of a snowplow or bulldozer) that pushes material to one side as the machine advances
2.
[ mold (III) , mould + board ]
: one of the boards forming a mold for concrete