What does citric acid mean in cooking?

citric acid means: Also called “sour salt”. White powder made from citrus juice and other acidic fruits like lemons, limes or pineapples. Also, it can be made from the fermentation of glucose. It has strong tart flavor and can be used to flavour foods. (in Cooking Dictionary)

What else does citric acid mean?

• Colorless, translucent, crystalline acid. ₆ H ₈ O ₇ It is primarily derived from the fermentation of carbohydrates, or lemon, lime and pineapple juices. This compound can be used to prepare citrates, flavorings, and metal polishes. (in Merlin Dictionary)