carbonic acid
noun/kɑːˌbɒnɪk ˈæsɪd/
/kɑːrˌbɑːnɪk ˈæsɪd/
[uncountable] (chemistry)- a very weak acid that is formed when carbon dioxide is dissolved in water
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carbonic acid
Definition of carbonic acid noun from the Oxford Advanced Learner's Dictionary