zoology āļāļ·āļāļāļ°āđāļĢ zoology āļāļ·āļāļāļ°āđāļĢ The branch of biology that deals with animals and animal life, including the study of the structure, physiology, development, and classification of animals.The animal life of a particular area or period: the zoology of Alaska; the zoology of the Pleistocene. The characteristics of a particular animal group or category: the zoology of mammals. A book or scholarly work on zoology.