From Longman Dictionary of Contemporary Englishcitric acidcit‧ric ac‧id /ˌsɪtrɪk ˈæsɪd/ noun [uncountable] HCDFa weak acid found in some fruits such as lemons
Examples from the Corpus
citric acid• Less threatening contents named by Mr Milburn included sucrose, cocoa, butter, liquorice root and citric acid.• Those used range from mild organic acids such as citric acid to phosphoric acid highly reactive sulphuric and hydrochloric acids.• The fact that lemons and limes share citric acid does not mean they share much else.• This is also known as the citric acid cycle or Krebs cycle. 