code book

American  

noun

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

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Etymology

Origin of code book

First recorded in 1880–85

Example Sentences

We, then decided after scanning the code book, that we wanted to make sure that this was a prosecution of both sets of victims, the majority of which were Kenyan victims.

From MSNBC • Jun. 19, 2019

At spy stations, young visitors can imitate her method, write messages in invisible ink and use a cipher wheel, an early encryption and decryption device, to reveal information in Tallmadge’s code book.

From New York Times • Sep. 20, 2018

A well-thumbed code book is preserved for display.

From Los Angeles Times • Sep. 24, 2016

When Groucho fails to understand the code book, Chico sells him a master code book.

From Time Magazine Archive

Simple codes like this are easy to remember, but anything complicated will need a code book, which can be hard to lug around.

From "The Woman All Spies Fear" by Amy Butler Greenfield