daemon

noun
dae·​mon

variant spelling of

1a : an evil spirit angels and demons
b : a source or agent of evil, harm, distress, or ruin the demons of drug and alcohol addiction confronting the demons of his childhood
2 usually daemon : an attendant (see attendant entry 2 sense 1) power or spirit : genius
3 usually daemon, mythology : a supernatural being whose nature is intermediate between that of a god and that of a human being
4 : one that has exceptional enthusiasm, drive, or effectiveness a demon for work Doug, putting like a demon, had birdies on the third and sixth …— Fred Tupper
5 daemon : a software program or process that runs in the background A mailer daemon installed on an e-mail system can respond to a piece of incorrectly addressed e-mail by generating an automated message to the sender that the message was undeliverable.— J. D. Biersdorfer

More from Merriam-Webster on daemon

Nglish: Translation of daemon for Spanish Speakers

Britannica.com: Encyclopedia article about daemon

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