The Collaborative International Dictionary of English v.0.48:

Zoolatry \Zo*ol"a*try\, n. [Zoo- + Gr. ? worship.]
   The worship of animals.
   [1913 Webster]

WordNet (r) 3.0 (2006):

zoolatry
    n 1: the worship of animals [syn: zoolatry, animal-worship]