The Collaborative International Dictionary of English v.0.48:

Umbellic \Um*bel"lic\, a. (Chem.)
   Pertaining to, or obtained from, certain umbelliferous
   plants; as, umbellic acid.
   [1913 Webster]

   Umbellic acid. (Chem.)
   (a) Anisic acid. [Obs.]
   (b) A yellow powder obtained from umbelliferone.
       [1913 Webster]