The Library has e-reference books (dictionaries, encyclopedias and handbooks) that can provide basic definitions or an overview on a research topic.
Try the Gale Virtual Reference Library.
It allows one to search all the content in the Gale collection. One can also click on the MEDICINE category to see what books are included in the search and liimit the search to a particular book.
Other sources of eBooks
Ebook Central (formerly Ebrary) features a growing selection of more than 150,000 titles from more than 200 leading academic, scientific, technical, medical, and professional publishers. You will need to sign in to view the ebooks. Go to Downloading ebooks for more information.