Etymology
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bookworm (n.)

1590s, "person devoted to study;" by 1713 in reference to the larvae of certain insects that eat holes in the bindings and paper of old books; see book (n.) + worm (n.). There is no single species known by this name, which is applied to the larvae of the anobium beetle (woodworm), silverfish, and booklice.

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Definitions of bookworm

bookworm (n.)
a person who pays more attention to formal rules and book learning than they merit;
Synonyms: pedant / scholastic
bookworm (n.)
someone who spends a great deal of time reading;
From wordnet.princeton.edu