#stone  building material consisting of a piece of rock hewn in a definite shape for a special purpose; "he wanted a special stone to mark the site"
  supertype:  building_material  material used for constructing buildings
  subtype:  ashlar  a rectangular block of hewn stone used for building purposes
  subtype:  Blarney_Stone  a stone in Blarney Castle in Ireland, said to impart skill in flattery to whoever kisses it
  subtype:  capstone__copestone__copingstone__stretcher  a stone that forms the top of wall or building
  subtype:  cornerstone  a stone at the outer corner of two intersecting masonry walls
  subtype:  cornerstone.stone  a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
  subtype:  foundation_stone  a stone laid at a ceremony to mark the founding of a new building
  subtype:  gravestone__headstone__tombstone  a stone that is used to mark a grave
  subtype:  grindstone  a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools
  subtype:  hearthstone  a stone that forms a hearth
  subtype:  millstone  one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain
  subtype:  monolith  a single great stone (often in the form of a column or obelisk)
  subtype:  paving_stone  a stone used for paving
     subtype:  cobble__cobblestone__sett  rectangular paving stone with curved top; once used to make roads
     subtype:  curbstone__kerbstone  a paving stone forming part of a curb
     subtype:  flagstone__flag  stratified stone that splits into pieces suitable as paving stones
  subtype:  springer__impost  the lowest stone in an arch -- from which it springs
  subtype:  stela__stele  an ancient upright stone slab bearing markings
  subtype:  whetstone  a flat stone for sharpening edged tools or knives
     subtype:  hone  a whetstone made of fine gritstone; used for sharpening razors
     subtype:  oilstone  a whetstone for use with oil

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