English
librarial
From library + -al.
A compound of library + -al
Latin liber ‘inner bark; book’
…
Latin librārium ‘bookcase’
Old French librairie
Anglo-Norman librarie
Middle English librarie ‘library’
English library
Today it means
adj Of, pertaining to, or characteristic of a library, librarianship or librarians.
Language periods are conventional ranges, not dates for this word.
Etymograph / librarial