citric acid Definition

a tricarboxylic acid C6H8O7 occurring in cellular metabolism, obtained especially from lemon and lime juices or by fermentation of sugars, and used chiefly as a flavoring

krebs cycle

a sequence of reactions in the living organism in which oxidation of acetic acid or acetyl equivalent provides energy for storage in phosphate bonds (as in ATP) —called also citric acid cycle, tricarboxylic acid cycle