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rock salt

noun
1.
common salt occurring in extensive, irregular beds in rocklike masses.
Origin
1700-1710
1700-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rock-salt

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 Origin and History for rock-salt
n.

1707, from rock (n.1) + salt (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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Difficulty index for rock salt

Few English speakers likely know this word

Word Value for rock

10
11
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