trans-Butanedioic acid; an unsaturated dicarboxylic acid occurring as an intermediate in the tricarboxylic acid cycle.
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fu·mar·ic acid fyu̇-.mar-ik- n a crystalline acid C4H4O4 formed from succinic acid as an intermediate in the Krebs cycle
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fu·mar·ic ac·id (fu-marґik) trans-butanedioic acid, the trans isomer of maleic acid, an intermediate in the tricarboxylic acid cycle (q.v.).Medical dictionary. 2011.