The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

         Betwixt two rows of rocks, a silvan scene
         Appears above, and groves forever green. --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sylvan \Syl"van\, n. [Sylva + furfuran.] (Chem.)
   A liquid hydrocarbon obtained together with furfuran (tetrol)
   by the distillation of pine wood; -- called also methyl
   tetrol, or methyl furfuran.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sylvan \Syl"van\, a. [See Silvan, a.]
   1. Of or pertaining to a sylva; forestlike; hence, rural;
      rustic.
      [1913 Webster]

            The traditional memory of a rural and a sylvan
            region . . . is usually exact as well as tenacious.
                                                  --De Quincey.
      [1913 Webster]

   2. Abounding in forests or in trees; woody.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sylvan \Syl"van\, n. [L. Sylvanus, better Silvanus. See
   Silvan, a.]
   A fabled deity of the wood; a satyr; a faun; sometimes, a
   rustic.
   [1913 Webster]

         Her private orchards, walled on every side,
         To lawless sylvans all access denied.    --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sylvan
    adj 1: relating to or characteristic of wooded regions; "a shady
           sylvan glade" [syn: sylvan, silvan]
    n 1: a spirit that lives in or frequents the woods [syn:
         sylvan, silvan]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "sylvan":
   afforestational, arboreous, back, back of beyond, back-country,
   backwood, backwoods, backwoodsy, bosky, braky, bushy, copsy,
   dendrologic, forest, forestal, forested, hinterland, outback,
   reforestational, scrubby, shrubby, silvicultural, timbered,
   up-country, virgin, waste, wild, wilderness, wooded, woodland,
   woodsy, woody



The Free On-line Dictionary of Computing (30 December 2018):

Sylvan

   [Distributed language?]