hearth·stone /-ˌston/
  爐底石,砌爐的石塊,家庭
  Hearth·stone n. Stone forming the hearth; hence, the fireside; home.
     Chords of memory, stretching from every battlefield and patriot grave to every living heart and hearthstone.   --A. Lincoln.
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  hearthstone
       n : a stone that forms a hearth