Etymology

From post-classical Latin helluōnēs librōrum ‎(“gluttons of books”), from classical Latin helluōnēs ‎(“gluttons”), nominative plural form of helluō ‎(“glutton”) + librōrum ‎(“of books”), genitive plural form of liber ‎(“book”).

Pronunciation

• (Received Pronunciation) enPR: hĕlyo͝oō'nēz lĭbrôʹrəm, IPA^(key): /hɛljʊˌəʊniːz lɪ̶ˈbɹɔːɹəm/
• (US) enPR: hĕlyo͞oō'nēz ləbrô(ə)ʹrəm, IPA^(key): /hɛljuˌoʊniz ləˈbɹɔə̆ɹəm/