Noah Webster's Dictionary (n.) The share of a plow, or that part which cuts the slice of earth or sod at the bottom of the furrow.

Multi-Version Concordance Ploughshare (1 Occurrence) 1 Samuel 13:20 And all Israel went down to the Philistines, every man to get his ploughshare, and his hoe, and his axe, and his sickle sharpened, (DBY YLT)