The Collaborative International Dictionary
Cryptonym \Cryp"to*nym\ (kr?p"t?-n?m), n. [Gr. ???? secret + ???? name.] A secret name; a name by which a person is known only to the initiated.
Wiktionary
n. A secret name, a code name.
Usage examples of "cryptonym".
Anton Murik had used as his personal cryptonym for Meltdown - Warlock.
Pollux were twins, but the men assigned those cryptonyms are McElroy and Conlin.
He got lists of various projects: acronyms, cryptonyms, tautonyms, Houyhnhnms.
Since cryptonyms gained their significance from their first two lettersam, for example, referred to Cuba.
Drew and Wilks, Thomas and Fletcher, Hackett and Pews-if they're not related, why give them cryptonyms that refer to brothers?
That's why their cryptonyms suggest they're brothers, even though their last names are different.
He'd chosen their cryptonyms from Greek and roman mythology, indulging his love of complexity, but now he recalled something else from that mythology-the Furies.