from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A word or name that is used secretly to refer to another; a code name or code word.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A secret name, a code name.
from the GNU version of the Collaborative International Dictionary of English
- n. A secret name; a name by which a person is known only to the initiated.
from The Century Dictionary and Cyclopedia
- n. A private, secret, or hidden name; a name which one bears in some society or brotherhood.
 A cryptonym is a combination of a two-letter digraph, which are either free-standing (e.g.,
Alex was the cryptonym for Colonel Oleg Vladimirovich Penkovsky of the GRU, a man who had provided the British and American intelligence services with information beyond price.
The agent's cryptonym was Night Stock, and his real name was Marcel Tiraque.
The Hypermarket material was straightforward. just as Oleg Penkovsky had slandered the Railton name, by directly suggesting that his cover was blown by an agent of influence working under the cryptonym Dionysus, so Blunt had, in a couple of sentences during one of the recent interrogation sessions, provided back-up mentions.
By the end of 1935 he was fully operational, with the cryptonym Dionysus.
It was not the mark of the infamous “Mendez”, but some newcomer with the lame cryptonym of “Radar”.
Once, sixteen tempo engineers, summarily banished to Asia Minor, decided to build a time main to escape, under the guise of constructing some sort of tower or dome; the name given to it was the cryptonym-password of their plot Banished Asian Builder's Escape League.
Tartar was only a cryptonym by which heretics knew each other, and adds: _Il n'y a donc pas trop à s'etonner des noms bizarres de
America, after its CIA cryptonym, and as the 28 Mordad 1332 coup in Iran, after its date on the Iranian calendar.
The American operation came to be known as Operation Ajax in America, after its CIA cryptonym, and as the