From The Art and Popular Culture Encyclopedia
Bibliomania is an obsessive-compulsive disorder involving the collecting or hoarding of books to the point where social relations or health are damaged. One of several psychological disorders associated with books, bibliomania is characterized by the collecting of books which have no use to the collector nor any great intrinsic value to a genuine book collector. The purchase of multiple copies of the same book and edition and the accumulation of books beyond possible capacity of use or enjoyment are frequent symptoms of bibliomania.
The term was coined by Dr. John Ferriar, a physician at the Manchester Royal Infirmary.
Bibliomania is not to be confused with bibliophily, which is the legitimate love of books and is not considered a clinical psychological disorder.