Source : Webster's Revised Unabridged Dictionary (1913)

Lichenic \Li*chen"ic\ (l[-i]*k[e^]n"[i^]k), a.
   Of, pertaining to, or obtained from, lichens.

   {Lichenic acid}.
   (a) An organic acid, {C14H24O3}, obtained from Iceland moss.
   (b) An old name of fumaric acid.