e-
pref.

A prefix that stands for "electronic" and refers to information technologies, business, and almost anything connected to or transmitted over the Internet. Some examples of its use include e-business, e-commerce, e-book, and e-mail.

tome
noun

1. One of the books in a work of several volumes.

2. A book, especially a large or scholarly one.

3. Originally "a single volume of a multi-volume work;" sense of "a large book" is attested from 1570s.