Definition of cryptonymous in US English:

cryptonymous

adjective

  • See cryptonym

    • ‘One unnamed, cryptonymous administration source said the report has already been optioned to Hollywood for an undisclosed sum.’
    • ‘Mailer comes up with a truly ingenious plot device: Harvey assigns Harry to track down the cryptonymous C.I.A. file clerk who, as Harvey sees it, defied his authority; reluctantly, Harry must trail himself.’

Pronunciation

cryptonymous

/kripˈtänəməs/