salt cake

salt cake

noun Chemistry.
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.

Origin:
1695–1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Salt cake is always a great word to know.
So is melamine. Does it mean:
a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation
a white, crystalline, slightly water-soluble solid, C3N3(NH2)3, used chiefly in organic synthesis and in the manufacture of resins
Collins
World English Dictionary
salt cake
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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