The Collaborative International Dictionary of English v.0.48:

Zealotry \Zeal"ot*ry\, n.
   The character and behavior of a zealot; excess of zeal;
   fanatical devotion to a cause.
   [1913 Webster]

         Enthusiasm, visionariness, seems the tendency of the
         German; zeal, zealotry, of the English; fanaticism, of
         the French.                              --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

zealotry
    n 1: excessive intolerance of opposing views [syn: fanaticism,
         fanatism, zealotry]