bookworm

• book worm

From book +‎ worm.

• IPA^(key): /ˈbʊk.wɜːm/

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bookworm (plural bookworms)

1. Any of various insects that infest books.
2. (figurative) An avid book reader.

   Synonyms: bibliophage, bibliophile, bibliovore, book lover, librophile, librovore

   Hyponyms: helluo librorum, bibliomane, bibliomaniac

   • 1846, Nathaniel Hawthorne, “Earth's Holocaust”, in Mosses from an Old Manse:

     “This,” remarked the sedate observer beside me, “is a bookworm,—one of those men who are born to gnaw dead thoughts. His clothes, you see, are covered with the dust of libraries.

• have one's nose in a book