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2 definitions found
 for Pitchstone
From The Collaborative International Dictionary of English v.0.48 :

  Pitchstone \Pitch"stone`\, n. (Geol.)
     An igneous rock of semiglassy nature, having a luster like
     pitch.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  pitchstone
      n 1: dark acid granitic glass

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