IPA: /ˌbɪb.lɪˈθɛ.kəl/
KK: /ˌbɪb.lɪˈoʊ.θɪ.kəl/
Relating to or characteristic of a library.
The bibliothecal resources were essential for the research project.
Bibliothecal is derived from "biblion" (meaning book) and "theke" (meaning storage or place). The word refers to something related to the storage or collection of books, hence its association with libraries.
Think of 'biblion' meaning book and 'theke' meaning storage — this helps you remember that bibliothecal relates to the storage or collection of books.
No commonly confused words.