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.

Source: Webster's Revised Unabridged Dictionary (1913)