The Collaborative International Dictionary of English v.0.48:

Zoology \Zo*ol"o*gy\, n.; pl. Zoologies. [Zoo- + -logy: cf. F.
   zoologie. See Zodiac.]
   [1913 Webster]
   1. That part of biology which relates to the animal kingdom,
      including the structure, embryology, evolution,
      classification, habits, and distribution of all animals,
      both living and extinct.
      [1913 Webster]

   2. A treatise on this science.
      [1913 Webster]