from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A colorless, crystalline compound, COOH·CH2·CHOH·COOH, that occurs naturally in a wide variety of unripe fruit, including apples, cherries, and tomatoes, and is used as a flavoring and in the aging of wine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A colourless crystalline dicarboxylic acid, hydroxy-malonic acid, found in wine, apples and other fruit; it is converted to lactic acid by malo-lactic fermentation.
from the GNU version of the Collaborative International Dictionary of English
- adj. a hydroxy acid (HO.CO.CH2.CH(OH).CO.OH) obtained from unripe fruit (such as green apples, currants, tomatoes or cherries) as a substance which is sirupy or crystallized with difficulty, and has a strong but pleasant sour taste. It is levorotatory or dextrorotatory according to the temperature and concentration; the natural form is of L- conformation. A synthetic variety is a derivative of succinic acid, but as with most simple synthetic compounds, is a racemic mixture of isomers and thus has no rotatory action on polarized light.
French (acide) malique, from Latin mālum, apple, from Greek mēlon, mālon.(American Heritage® Dictionary of the English Language, Fourth Edition)