The Collaborative International Dictionary of English v.0.48:

Sylvic \Syl"vic\, a. (Chem.)
   Of, pertaining to, or resembling, pine or its products;
   specifically, designating an acid called also abeitic acid,
   which is the chief ingredient of common resin (obtained from
   Pinus sylvestris, and other species).
   [1913 Webster]