\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}.