Citric acid - definition from Biology-Online.org
[(Science: biochemistry) An important intermediate in the citric Acid Cycle which breaks down glucose into water and carbon dioxide when oxygen is present. The acid contains three carboxyl groups, has the chemical formula of C6H8O7, and is found in citrus fruits (oranges, grapefruit, lemons, etc.). It is used as an antioxidant and as artificial flavouring in commercially-processed foods.
MediLexicon citric acid - Medical Dictionary Definition for Term 'citric acid'
[1. The acid of citrus fruits, widely distributed in nature and a key intermediate in intermediary metabolism.
CAS number 77-92-9
PubChem CID 311
CAS 77-92-9 (from NIST)
PubChem ID 11532236
PubChem ID 3458