There are 3 main definitions of demon in English:

demon1

Syllabification: de·mon
Pronunciation: /ˈdēmən
 
/

noun

1An evil spirit or devil, especially one thought to possess a person or act as a tormentor in hell.
More example sentences
  • But there is simply no credible evidence to suggest the boy was possessed by demons or evil spirits.
  • Tibetans treat the blind as outcasts because they believe they are possessed by demons or have committed evil in a prior life.
  • In Tartini's time, the Devil personified the spirit of evil, a demon, the ruler of Hell, and the chief adversary of God.
Synonyms
1.1A cruel, evil, or destructive person or thing: I was a little demon, I can tell you
More example sentences
  • No, they are not animals, they are evil demons who hide under the cloak of kindness and normality while they hatch their plots.
  • Why did he go from nearly human to cruel demon in a heartbeat?
  • Three, I'm a sadistic demon that delights in your emotional pain.
Synonyms
1.2 [often as modifier] A forceful, fierce, or skillful performer of a specified activity: a friend of mine is a demon cook a demon for work
More example sentences
  • Our first tests of the company's new speed demon show some impressive performance gains.
  • Remember those occasions when he would have made batting easy for his partners by taking on the demon bowlers all by himself.
  • Cotton might not be the demon fabric that performance apparel manufacturers say it is, but I'm going to keep my Under Armour shirt.
Synonyms
pro, ace, expert, genius, master, virtuoso, maestro, past master, marvel;
star
informal hotshot, whiz, buff
1.3Reckless mischief; devilry: his eyes are bursting with pure demon
More example sentences
  • So how odd that Howard should invest so much time and political capital in building a whole speech round this non-existent demon.
2 another term for daemon1 (sense 1).
More example sentences
  • The gods of the world are having trouble keeping the demons at bay, and so they come up with a last-ditch scheme - to resurrect a dead hero.

Origin

Middle English: from medieval Latin, from Latin daemon, from Greek daimōn 'deity, genius'; sense 1 also from Latin daemonium 'lesser or evil spirit', from Greek daemonion, diminutive of daimōn.

Phrases

like a demon

In a very forceful, fierce, or skillful way: he worked like a demon
More example sentences
  • We had our excuses - Papa watched TV late and loud and snored like a demon and my reading lamp bothered Mother.
  • Toby in front of me was rowing like a demon, his competitiveness harnessed and proving very effective and Wheelie kept bellowing and keeping us focused.
  • After all, he scored the first goal, made the third and defended like a demon for the two periods of extra-time.

Definition of demon in:

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There are 3 main definitions of demon in English:

demon2

Syllabification: de·mon
Pronunciation: /ˈdēmən
 
/

noun

Variant spelling of daemon2.

Definition of demon in:

There are 3 main definitions of demon in English:

demon3

Line breaks: demon

Entry from British & World English dictionary

noun

Variant spelling of daemon2.

Definition of demon in: