#plow__plough  a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing
  supertype:  #tool  an implement used in the practice of a vocation
  subtype:  #bull_tongue  a heavy plow with a single wide blade; used chiefly in cotton fields
  subtype:  #moldboard_plow__moldboardplow__mouldboard_plough  plow that has a moldboard
     subtype:  #lister_plough__lister__lister_plow__middlebreaker__middle_buster  moldboard plow with a double moldboard designed to move dirt to either side of a central furrow

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