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Noun: rootkit  'root,kit
  1. (computing) software used to hide the fact that a computer system has been compromised, for example by modifying system commands to conceal changes made to the system
    "One of the most feared of all types of malware is the rootkit, software that is nearly undetectable"

Derived forms: rootkits

Type of: malevolent program, malware

Encyclopedia: Rootkit