资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

   {Plowshare bone} (Anat.), the pygostyle.