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salt cake

noun Chemistry.
  1. an impure form of sodium sulfate, especially as obtained by the interaction of sulfuric acid and common salt in the synthesis of hydrochloric acid: used chiefly in the manufacture of glass, ceramic glazes, soaps, and sodium salts.
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Origin of salt cake

First recorded in 1695–1705
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for salt cake

salt cake

noun
  1. an impure form of sodium sulphate obtained as a by-product in several industrial processes: used in the manufacture of detergents, glass, and ceramic glazes
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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