a person considered extremely wicked, evil, or cruel.
a person with great energy, drive, etc.: He's a demon for work.
a person, especially a child, who is very mischievous: His younger son is a real little demon.
daemon.
AustralianSlang. a policeman, especially a detective.
adjective
of, pertaining to, characteristic of, or noting a demon.
possessed or controlled by a demon.
Origin of demon
1350–1400; Middle English <Latin daemonium<Greek daimónion, thing of divine nature (in Jewish and Christian writers, evil spirit), neuter of daimónios, derivative of daímōn;(def. 6) <Latin; see daemon
a person, habit, obsession, etc, thought of as evil, cruel, or persistently tormenting
Also called: daemon, daimonan attendant or ministering spirit; geniusthe demon of inspiration
a person who is extremely skilful in, energetic at, or devoted to a given activity, esp a sporta demon at cycling
(as modifier)a demon cyclist
a variant spelling of daemon (def. 1)
Australian and NZinformal, archaica detective or policeman
computinga part of a computer program, such as a help facility, that can run in the background behind the current task or application, and which will only begin to work when certain conditions are met or when it is specifically invoked
Word Origin for demon
C15: from Latin daemōn evil spirit, spirit, from Greek daimōn spirit, deity, fate; see daemon