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keystone Twit Definition of keystone Share Definition of keystone on Facebook Digg:Definition of keystone! stumble Definition of keystone Bookmark Definition of keystone on Delicious submit Definition of keystone to reddit Bookmark Definition of keystone
noun 
  1. (architecture) The top stone of an arch.
Translations: 
  • German: SchluíŸstein (1)
  • Italian: chiave di volta
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