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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 pitchstone
 松脂石; 松脂岩

From: Webster's Revised Unabridged Dictionary (1913)

 Pitch·stone n. Geol. An igneous rock of semiglassy nature, having a luster like pitch.
 

From: WordNet (r) 2.0

 pitchstone
      n : dark acid granitic glass