washing soda

noun
sodium carbonate ( def 2 ).

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
washing soda
 
n
the crystalline decahydrate of sodium carbonate, esp when used as a cleansing agent

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Residents collected and pressed the minerals into blocks that were shipped by train to be sold as washing soda.
Use soap flakes and borax or washing soda and borax instead of detergent.
Large amounts are used in the non-ferrous metals industry and in the production of bicarbonate and washing soda.
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