BOOKWORM
bookworm
(noun) someone who spends a great deal of time reading
pedant, bookworm, scholastic
(noun) a person who pays more attention to formal rules and book learning than they merit
Source: WordNet® 3.1
Etymology
Noun
bookworm (plural bookworms)
Any of various insects that infest books.
(figurative) An avid book reader.
Synonyms: bibliophile, book lover
Source: Wiktionary
Book"worm`, n.
1. (Zoöl.)
Definition: 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: Webster’s Unabridged Dictionary 1913 Edition