code book

a book containing a list of code signals with their meanings, usually arranged alphabetically.

Origin of code book

First recorded in 1880–85

For a matter of ten minutes Thomson was busy with his pencil and the code-book.

The Kingdom of the Blind |E. Phillips Oppenheim
When he went out I drew my code-book from my breeches-pocket and tossed it into the fire.

The Maids of Paradise |Robert W. (Robert William) Chambers
"Not the cipher itself—at least not a code-book as the term is generally understood," explained the Under Secretary.

On Secret Service |William Nelson Taft
Then he replaced the code-book in the safe, which he carefully locked, and strolled towards the window.

The Kingdom of the Blind |E. Phillips Oppenheim

Do you go to the meeting, with the code-book as your only exhibit.

The Cab of the Sleeping Horse |John Reed Scott