'Ploughshare' definitions:

Definition of 'ploughshare'

From: WordNet
noun
A sharp steel wedge that cuts loose the top layer of soil [syn: plowshare, ploughshare, share]

Definition of 'Ploughshare'

From: GCIDE
  • Plowshare \Plow"share`\, Ploughshare \Plough"share"\, n. The share of a plow, or that part which cuts the slice of earth or sod at the bottom of the furrow. [1913 Webster]
  • Plowshare bone (Anat.), the pygostyle. [1913 Webster] Plowtail