Hydroxysuccinic acid; an acid found in apples and various other tart fruits; an intermediate in the tricarboxylic acid cycle, the glyoxylate cycle, and in a shuttle system. SYN: monohydroxysuccinic acid.
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malic acid n any of three optical isomers of a crystalline dicarboxylic acid C4H6O5 esp the one found in various plant juices and formed as an intermediate in the Krebs cycle
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mal·ic ac·id (maґlik) (malґik) an intermediate in the tricarboxylic acid (Krebs) cycle, formed from fumaric acid and itself oxidized to form oxaloacetic acid; found in apples, pears, and many other fruits; its action is similar to that of tartaric acid, and it is a permitted food additive.Medical dictionary. 2011.