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rock salt

noun

  1. common salt occurring in extensive, irregular beds in rocklike masses.

rock salt

noun

  1. another name for halite

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of rock salt1

First recorded in 1700–10

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rock salmonrockshaft

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