codebook
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code·book
(kōd′bo͝ok′)n.
A book that lists the symbols of a code and their meanings.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
codebook
(ˈkəʊdˌbʊk)n
a book containing the means to decipher a code
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014