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maleic acid ma·le·ic acid (mə-lē'ĭk)
A colorless crystalline dibasic acid that is an isomer of fumaric acid and is used as an oil and fat preservative.
unsaturated organic dibasic acid, used in making polyesters for fibre-reinforced laminated moldings and paint vehicles, and in the manufacture of fumaric acid and many other chemical products. Maleic acid and its anhydride are prepared industrially by the catalytic oxidation of benzene.