A knife or cutter attached to the beam of a plow to cut the sward, in advance of the plowshare and moldboard.
(RQ:Spenser Faerie Queene)
(quote-text)
{{quote-book|en|year=1791|author=Erasmus Darwin|title=The Economy of Vegetation|publisher=J. Johnson|page=150
The part of a drill that makes the furrow for the seed.
(alt form)