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hard·ness (härd'nĭs)
n.
  1. The quality or condition of being hard.
  2. The relative resistance of a mineral to scratching, as measured by the Mohs scale.
  3. The relative resistance of a metal or other material to denting, scratching, or bending.

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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