noun
bookworm; bibliomaniac; book nut
Derogatory term for someone obsessed with books, often implying excessive or eccentric devotion to reading or collecting.
彼は一日中本を読んでいる書痴だ。
He's a bookworm who reads all day long.
あの書痴は部屋中が本で埋まっている。
That bibliomaniac's room is filled with books.