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Definition of washing soda noun from the Oxford Advanced Learner's Dictionary

washing soda

noun
 
/ˈwɒʃɪŋ səʊdə/
 
/ˈwɑːʃɪŋ səʊdə/
(also sodium carbonate)
[uncountable]
(symbol Na2CO3)
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  1. a chemical in the form of white crystals or powder that dissolves (= turns to liquid when mixed with another liquid) and is used in making glass, soap and paper, and for making water soft
See washing soda in the Oxford Advanced American Dictionary

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