bookworm Syllabification: (book·worm)Pronunciation: /ˈbo͝okˌwərm/Translate bookworm | into French | into German | into Italian Definition of bookworm noun 1 informal a person devoted to reading. 2the larva of a wood-boring beetle that feeds on the paper and glue in books. bookworm in other Oxford dictionaries Definition of bookworm in the British & World English dictionary