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]