You can call a book lover a bibliophile. If you find it impossible to leave a book store without buying at least one book, you might be a bibliophile.
A bibliophile usually has a huge collection of books and loves nothing more than browsing in a used book shop or a library. A love of books or a deep knowledge about them makes a person a bibliophile. The earliest use of the word bibliophile was in 1820s France, and it came from the Greek prefix biblio, or "book," and the word philos, or "friend." If you consider books to be your true friends, you are definitely a bibliophile.