/ Dictionary / Index C code book: Meaning and Definition of Find definitions for: code' book" Pronunciation: [key] a book containing a list of code signals with their meanings, usually arranged alphabetically. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. code blue codeclination Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language