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rock salt

 - 2 dictionary results

rock salt

–noun
common salt occurring in extensive, irregular beds in rocklike masses.

Origin:
1700–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rock salt  
n.  
  1. Rock containing halite as its main constituent.

  2. Coarsely ground or granulated common salt.

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