Source : Webster's Revised Unabridged Dictionary (1913)

Mistletoe \Mis"tle*toe\, n. [AS. mistelt[=a]n; mistel mistletoe
   + t[=a]n twig. AS. mistel is akin of D., G., Dan. & Sw.
   mistel, OHG. mistil, Icel. mistilteinn; and AS. t[=a]n to D.
   teen, OHG. zein, Icel. teinn, Goth. tains. Cf. {Missel}.]
   (Bot.)
   A parasitic evergreen plant of Europe (Viscum album), bearing
   a glutinous fruit. When found upon the oak, where it is rare,
   it was an object of superstitious regard among the Druids. A
   bird lime is prepared from its fruit. [Written also
   {misletoe}, {misseltoe}, and {mistleto}.] --Lindley. Loudon.

   Note: The mistletoe of the United States is {Phoradendron
         flavescens}, having broader leaves than the European
         kind. In different regions various similar plants are
         called by this name.

Source : WordNet®

mistletoe
     n 1: American plants closely resembling Old World mistletoe [syn:
           {false mistletoe}]
     2: Old World parasitic shrub having branching greenish stems
        with leathery leaves and waxy white glutinous berries; the
        traditional mistletoe of Christmas [syn: {Viscum album}, {Old
        World mistletoe}]
     3: shrub of central and southeastern Europe; partially
        parasitic on beeches, chestnuts and oaks [syn: {Loranthus
        europaeus}]