1. a secret name or code name

Examples

• The spy operated under the cryptonym ‘Phoenix’ during the mission.
• Intelligence agencies often assign cryptonyms to their classified operations.
• The document revealed that ‘Blue Moon’ was the cryptonym for the secret project.
• Each agent was given a unique cryptonym to protect their identity.
• The cryptonym appeared in several declassified files from the Cold War era.
• Military planners used the cryptonym ‘Thunder’ for the invasion strategy.