Zombie

The classic version is a mindless, frequently violent, product of supernatural magic or pharmacology while the modern incarnation is a reanimated human corpse infected with an unexplained contagion that is relentless and aggressive.

A process that has died (exited) but whose parent has not yet received proper notification of its demise by virtue of having called wait or waitpid. If you fork, you must clean up after your child processes when they exit, or else the process table will fill up and your system administrator will Not Be Happy with you.

A program that is installed on a system to cause it to attack other systems.