Source : Webster's Revised Unabridged Dictionary (1913)

Viscous \Vis"cous\, a. [L. viscosus. See {Viscid}.]
   Adhesive or sticky, and having a ropy or glutinous
   consistency; viscid; glutinous; clammy; tenacious; as, a
   viscous juice. -- {Vis"cous*ness}, n.

   Note: There is no well-defined distinction in meaning between
         viscous and viscid.

Source : WordNet®

viscous
     adj 1: having a relatively high resistance to flow [syn: {syrupy}]
     2: having the properties of glue [syn: {gluey}, {glutinous}, {gummy},
         {mucilaginous}, {pasty}, {sticky}, {viscid}]