reference book reference book
- A book, such as a dictionary or encyclopedia, to which one can refer for authoritative information.
- See passbook.
(plural reference books)
- A book providing factual information.
- The Red Book is the standard reference book for those naming inorganic chemical compounds.
- (libraries) such a book that may not be borrowed.
- I wanted to take out the encyclopedia, but the librarian said it was a reference book.