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

caustic soda

noun
 
/ˌkɔːstɪk ˈsəʊdə/
 
/ˌkɔːstɪk ˈsəʊdə/
[uncountable]
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  1. a chemical used in making paper and soap
See caustic soda in the Oxford Advanced American Dictionary
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