The Collaborative International Dictionary of English v.0.48:

Missel \Mis"sel\, n.
   Mistletoe. [Obs.]
   [1913 Webster]

   Missel bird, Missel thrush (Zool.), a large European
      thrush (Turdus viscivorus) which feeds on the berries of
      the mistletoe; -- called also mistletoe thrush and
      missel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

missel thrush
    n 1: large European thrush that feeds on mistletoe berries [syn:
         missel thrush, mistle thrush, mistletoe thrush,
         Turdus viscivorus]