n. A person who is obsessed with owning valuable books.
the GNU version of the Collaborative International Dictionary of English
n. One who has a mania for books.
The Century Dictionary and Cyclopedia
n. One affected with bibliomania.
Affected by or pertaining to bibliomania; book-mad. Also bibliomanian.
Word Usage
"I hesitated a moment; but having heard that such communications were usually made by the visitors of show places, I answered: "Oh! a very venerable one, if your master is what they call a bibliomaniac -- Caxton.""