A larva of any insect which harms books by feeding on their binding or leaves. As they eat they way through the pages of a book, they leave a trail known as “worming.” Also, a term for a person devoted to books.

1590s (of people), 1855 of insects or maggots; there is no single species known by this name, which is applied to the anolium beetle, silverfishes, and book lice. See book (n.) + worm (n.).

any of a number of moth or fly larvae which tunnel through the pages of books leaving behind small channels, holes in individual leaves. Very early books often have some evidence of bookworm damage.

(revision in progress) Borrowings:

Any of a number of moth or fly larvae which tunnel through the pages of books leaving behind small channels, holes in individual leaves. Very early books often have some evidence of bookworm damage.

The larval form of a variety of flying beetles that damages books and other printed materials by feeding on digestible materials in paper, paste, glue, sewing thread, boards, and leather, leaving smal [..]

(n) a person who pays more attention to formal rules and book learning than they merit(n) someone who spends a great deal of time reading

One always poring over his books; so called in allusion to the insect that eats holes in books, and lives both in and on its leaves.