/ Dictionary / Index C code blue: Meaning and Definition of Find definitions for: code' blue' Pronunciation: [key] (often caps.) a medical emergency in which paramedics are dispatched to aid a person undergoing cardiac arrest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. code code book Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language