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key·stone (kē'stōn')
n.
  1. Architecture. The central wedge-shaped stone of an arch that locks its parts together. Also called headstone.
  2. The central supporting element of a whole.

logo The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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