What is anthropology the study of?
While a standard dictionary will provide a straightforward definition (try m-w.com, Merriam Webster's site), your question is ultimately complex, since there are potentially many different ways of defining anthropology as well as different types of anthropology (cultural, biological, etc.).
I suggest starting with an encyclopedia or dictionary that focuses specifically on anthropology. This will allow you to go into greater depth than a regular dictionary but not so much depth that you won't be able to make sense of the explanation. You might try the 2002 Companion Encyclopedia of Anthropology, located on the third floor of Ekstrom (call# GN25 .C65 2002). If you have trouble finding it, stop by the reference desk on the first floor, give us a call at 852-6747, or send another question via LibAnswers.
If you plan to do more extensive research, there are additional resources that you can link to from the Anthropology LibGuide. Please let us know how we provide additional guidance with your research.