Source : Webster's Revised Unabridged Dictionary (1913)

Bookworm \Book"worm`\, n.
   1. (Zo["o]l.) Any larva of a beetle or moth, which is
      injurious to books. Many species are known.

   2. A student closely attached to books or addicted to study;
      a reader without appreciation.

            I wanted but a black gown and a salary to be as mere
            a bookworm as any there.              --Pope.

Source : WordNet®

bookworm
     n 1: a person who pays more attention to formal rules and book
          learning than they merit [syn: {pedant}, {scholastic}]
     2: someone who spends a great deal of time reading