• synonyms

rock salt

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

Origin of rock salt

First recorded in 1700–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rock-salt

Historical Examples of rock-salt

  • These beds of rock-salt, when worked to supply salt, are called salt-mines.

    The Desert Home

    Mayne Reid

  • The plains, in the interior, are noted for the production of rock-salt.

  • The brown or rock-salt is dug out of mines, and we went down one of these.

    The Swan and Her Crew

    George Christopher Davies

  • A piece of rock-salt left there as well will never be amiss.

    Riding for Ladies

    Mrs. Power O'Donoghue

  • Rock-salt is another substance which hinders the passage of the rays.

British Dictionary definitions for rock-salt

rock salt

  1. another name for halite
Show More
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

Word Origin and History for rock-salt


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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper