Fu·mar·ic a. Chem. Pertaining to, or derived from, fumitory (Fumaria officinalis).
  Fumaric acid Chem., a widely occurring organic acid, extracted from fumitory as a white crystallline substance, C2H2(CO2H)2, and produced artificially in many ways, as by the distillation of malic acid; boletic acid. It is found also in the lichen, Iceland moss, and hence was also called lichenic acid.
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  Fumaria officinalis
       n : delicate European herb with grayish leaves and spikes of
           purplish flowers; formerly used medicinally [syn: fumitory,
            fumewort, fumeroot]