Source : Webster's Revised Unabridged Dictionary (1913)

Viscum \Vis"cum\, n. [L.]
   1. (Bot.) A genus of parasitic shrubs, including the
      mistletoe of Europe.

   2. Birdlime, which is often made from the berries of the
      European mistletoe.

Source : WordNet®

Viscum
     n : type genus of the Viscaceae: Old World evergreen shrubs
         parasitic on many trees including oaks but especially
         apple trees, poplars, aspens and cottonwoods [syn: {genus
         Viscum}]