Source : Webster's Revised Unabridged Dictionary (1913)

Fumaric \Fu*mar"ic\, a. (Chem.)
   Pertaining to, or derived from, fumitory ({Fumaria
   officinalis}).

   {Fumaric acid} (Chem.), a widely occurring organic acid,
      exttracted 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}.