A person who suffers from bibliokleptomania; someone with a compulsive psychological urge to steal books.
From bibliokleptomania + -ac (Greek -akos, forming nouns for affected persons). Emerged in 19th-century medical and psychological literature to describe individuals with this specific compulsion.
A bibliokleptomaniac might steal the same book multiple times from different libraries without remembering, or steal books they can easily afford—it's the act, not the acquisition, that drives them.
Complete word intelligence in one call. Free tier — 50 lookups/day.