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touchstone definition

touch·stone (tuc̸h′stōn′)

noun

  1. a type of black stone formerly used to test the purity of gold or silver by the streak left on it when it was rubbed with the metal
  2. any test of genuineness or value

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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