The Collaborative International Dictionary of English v.0.48:

Zoo- \Zo"o-\
   A combining form from Gr. zwo^,n an animal, as in zoogenic,
   zoology, etc.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "zoo":
   Festschrift, ana, anthology, aquarium, body, chrestomathy,
   collectanea, collection, compilation, corpus, data, florilegium,
   fund, holdings, library, menagerie, museum, raw data, treasure,
   zoological garden