reference book
nounUK /ˈrɛf.rəns bʊk/
US /ˈrɛf.rəns bʊk/
A reference book is a book you look at to find facts and answers, like a dictionary or an encyclopedia.
She used a reference book to check the spelling of the word.
RELATED WORDS
OTHER MEANINGS
2. A book kept for consultation rather than for reading from start to finish.
The library keeps its reference books in a special section.
3. A book containing organized information on a particular subject.
This medical reference book lists common symptoms and treatments.
4. A work such as a directory or index used to look things up quickly.
He checked the phone reference book to find the number.