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3 definitions found

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

 horn·stone /ˈhɔrnˌston/
 角石

From: Webster's Revised Unabridged Dictionary (1913)

 Horn·stone n. Min. A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert.
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From: WordNet (r) 2.0

 hornstone
      n : a fine-grained metamorphic rock formed by the action of heat
          on clay rocks [syn: hornfels]