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)


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