Etymology
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Words related to demon

*da- 

*dā-, Proto-Indo-European root meaning "to divide."

It forms all or part of: betide; daimon; Damocles; deal (v.); deal (n.1) "part, portion;" demagogue; demiurge; democracy; demography; demon; demotic; dole; endemic; epidemic; eudaemonic; geodesic; geodesy; ordeal; pandemic; pandemonium; tidal; tide (n.) "rise and fall of the sea;" tidings; tidy; time; zeitgeist.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dati "cuts, divides;" Greek dēmos "people, land," perhaps literally "division of society," daiesthai "to divide;" Old Irish dam "troop, company;" Old English tid "point or portion of time," German Zeit "time."

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daimon (n.)

a transliteration of Greek daimōn "lesser god, guiding spirit, tutelary deity," 1852; see demon. Employed to avoid the post-classical associations of demon. Related: Daimonic.

Algol 
variable star (Beta Persei) in the constellation Perseus, late 14c., literally "the Demon," from Arabic al-ghul "the demon" (see ghoul). It corresponds, in modern representations of the constellation, to the gorgon's head Perseus holds, but probably it was so called because it visibly varies in brightness every three days, which sets it apart from other bright stars.

The computer language (1959) is a contraction of algo(rithmic) l(anguage); see algorithm.
daemon (n.)

alternative spelling (in specialized senses) of demon (q.v.); also compare daimon. Related: Daemonic.

demonarchy (n.)

"rule or dominion of demons," 1640s; see demon + -archy.

demoness (n.)

"female demon," 1630s; see demon + -ess.

demoniac (adj.)

c. 1400, "possessed by a demon, insane," earlier (late 14c.) as a noun, demoniak, "one who is possessed, a lunatic," from Late Latin daemoniacus, from Greek daimoniakos "possessed by a demon," from diamon (see demon). From 1640s as "of or pertaining to demons or spirits;" by 1820 as "devilish." Related: Demoniacal; demoniacally.

demonic (adj.)

also daemonic, 1660s, "devilish, of the nature of or pertaining to a demon," from Latin daemonicus, from daemon (see demon). Demonical is from late 15c.

demonize (v.)

"to make into a demon" (literally or figuratively), 1778, from demon + -ize or else from Medieval Latin daemonizare. Greek daimonizesthai meant "to be under the power of a tutelary deity," in the New Testament, "to be possessed by a demon." Also demonise. Related: Demonized; demonizing; demonization (1799).

demonology (n.)

"the study of demons or beliefs about demons," 1590s; see demon + -ology. Related: Demonologer; demonological.