Definitions
Century Dictionary and Cyclopedia
- n. A chief fiend; specifically, the devil.
Examples
“A conspiracy organised not by a single scheming arch-fiend, but collectively by the British establishment – judges, lawyers, politicians, police chiefs, secret services, even newspaper editors – all of whom have been appointed to their positions because they are "a safe pair of hands".”
The Guardian: Unlawful Killing – the film the British won't get to see | Keith Allen
“So was Constantine, the arch-fiend, the devil's right hand.”
“All, save I, were at rest or in enjoyment: I, like the arch-fiend, bore a hell within me; and, finding myself unsympathised with, wished to tear up the trees, spread havoc and destruction around me, and then to have sat down and enjoyed the ruin.”
“But it had like its eponymous arch-fiend the power to haunt.”
“The popular, but by comparison often inane, companion piece Rizzoli & Isles (10/9c) ends its summer run with the return of arch-fiend Charles Hoyt (the slithery Michael Massee), who says he has info on a jailhouse murder.”
Matt's Guide to the TV Week: Closer Finale, CW and NBC Premieres, and More
“Or have we invented an arch-fiend to accommodate a pop-culture figure whose agent got him on the show?”
“And that can only mean we are up against the arch-fiend . . .”
“What is your personal worst case scenario for this arch-fiend?”
“It has kept my ancestors fed during good times and bad, especially during the dark days when the Republicans sought to oppress the American constitution at the instigation of the arch-fiend Republican Abraham Lincoln.”
“Humanity's arch-fiend enemies — the howling, braying Locust horde — were secretly fighting an internal civil war.”
Wired: Games Without Frontiers: Bad Story, Great Game -- How Mediocrity Gooses 'Gears of War 2'
Lists
These user-created lists contain the word ‘arch-fiend’.
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miltonic
liberty, froth-becurlèd, host, huge-bellied, aghast, rills, gladsom, wrathfull, ordain, thunder-clasping, ruddy, warble and 264 more...
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arch-
chief; principal
archbishop, arch-fiend, archdiocese, archbishopric, arch-enemy, archangel, archetype
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Cat Kisses Favorites
leprechaunic hair, a dinky grin, strangled giggle, a waft of words, comatose fun, a grisly shooting..., jim bag clothes, to quench and fuss, shutter hole, tearful sludge, dead-eye blue, coughing curtains... and 97 more...
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Darqueau's list
banausic, nugatory, psychogeography, peripatetic, dérive, flâneur, banausos, brash, anarchy, dada, neo-plastic, potawatomi and 81 more...
Tweets
Looking for tweets for arch-fiend.

asativum Hm. That comment was supposed to go on aright, which I got to from the random word list. Bug? Apr 15, 2008
asativum Also, an interjection in the American South. As in, "Aright, let's git 'er done." Apr 14, 2008