Source : Webster's Revised Unabridged Dictionary (1913)

Silvan \Sil"van\, a. [L. silva, less correctly sylva, a wood or
   grove, perh. akin to Gr. "y`lh; cf. L. Silvanus Silvanus the
   god of woods: cf. F. sylvain silvan. Cf. {Savage}.]
   Of or pertaining to woods; composed of woods or groves;
   woody. [Written also {sylvan}.]

         Betwixt two rows of rocks, a silvan scene Appears
         above, and groves forever green.         --Dryden.

Silvan \Sil"van\, n. (Old Chem.)
   See {Sylvanium}. [Obs.]

Source : WordNet®

silvan
     adj : relating to or characteristic of wooded regions; "a shady
           sylvan glade" [syn: {sylvan}]
     n : a spirit that lives in or frequents the woods [syn: {sylvan}]