1) The board or plate in a plough which turns over the earth to make the furrow.
1395 It. pro ix molebrodclowtys, Whitby
c.1535 twelue plowght hedes … vj molberdes, Stillingfleet
1581 for mouldbord clout and the shares, Stockeld
1656 In the Stable Chamber: Item two ploughes … and five mold boards, Eshton
1681 20 mold bords, 3 harow sweards, 6 pare of plough stilts, Burn. In cases where confusion with moulding-board might be possible the context is important: 1612 speakes, 2 mowlbreads 3 axle trees, Eccleshill
1638 a malding bord, 2 saddels & 3 pannels, Gateford.