A person who is obsessed with owning valuable books.(noun)
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Use "bibliomaniac" in a sentence
"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.""
"The bibliomaniac, that is, remakes the literary heritage as his cabinet library."
"Called a "baby bibliomaniac" as a child, he acquired his first book at auction, the fable "Reynard the Fox," at age 11."