washing soda
noun/ˈwɒʃɪŋ səʊdə/
/ˈwɑːʃɪŋ səʊdə/
(also sodium carbonate)
[uncountable] (symbol Na2CO3)
- 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
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washing soda