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The Collaborative International Dictionary
Roil

Roil \Roil\, v. t. [imp. & p. p. Roiled; p. pr. & vb. n. Roiling.] [Cf. OE. roilen to wander; possibly fr. OF. roeler to roll, equiv. to F. rouler. See Roll, v., and cf. Rile.]

  1. To render turbid by stirring up the dregs or sediment of; as, to roil wine, cider, etc., in casks or bottles; to roil a spring.

  2. To disturb, as the temper; to ruffle the temper of; to rouse the passion of resentment in; to perplex.

    That his friends should believe it, was what roiled him [Judge Jeffreys] exceedingly.
    --R. North.

    Note: Provincial in England and colloquial in the United States. A commoner, but less approved, form is rile.

Roil

Roil \Roil\, v. i.

  1. To wander; to roam. [Obs.]

  2. To romp. [Prov. Eng.]
    --Halliwell.

Douglas Harper's Etymology Dictionary
roil

1580s, of uncertain origin, probably from Middle French rouiller "to rust, make muddy," from Old French roil "mud, muck, rust" (12c.), from Vulgar Latin *robicula, from Latin robigo "rust" (see robust). An earlier borrowing of the French verb is Middle English roil "to roam or rove about" (early 14c.). Related: Roiled; roiling.

Wiktionary
roil

vb. 1 To render turbid by stirring up the dregs or sediment of 2 To annoy; to make someone angry. 3 (context intransitive English) To bubble, seethe.

WordNet
roil
  1. v. be agitated; "the sea was churning in the storm" [syn: churn, boil, moil]

  2. make turbid by stirring up the sediments of [syn: rile]

Usage examples of "roil".

Figuring that the greeting was going to go on for a little while longer, Ake skirted the roiling mass of dog fur and confusion and approached Skerchock.

Timothy spun to see Lord Nicodemus descending the stairs toward them with Alastor in his arms, a roiling cloud of supernatural energies drifting behind and above him.

We have seen that the uncertainty principle ensures that even the vacuum of empty space is a teeming, roiling frenzy of virtual particles momentarily erupting into existence and subsequently annihilating one another.

When the thuggish mullahs jailed blogger Sina Motallebi, fury roiled the blogosphere.

Flares ripped through the roiling photosphere, followed by a blinding armada of ellipsoid faeros ships that collided with a thousand diamond-hulled warglobes in the sea of flames.

The three pursuing cats jumped gracefully onto the porch roiling and sat down, curling their tails around their feet, just as Fiddlesticks poked his head out of the front door.

Beyond the reef, the surf flamed and crashed, and the ocean was roiled and streaked with the cold flimmer of phosphorescence.

Steam roiling up from the lake, the mud pots, the fumaroles, glowed in opalescent plumes.

His entire body was swaddled in roiling clouds the color of turquoise, and great torrents of salty water poured from the claws at the end of his gangling arms.

The winds had gusted great roils, rock cumulonimbus on the anvil-tops of which they laid tracks quickly, nervous that they might revert.

And then I finally succumbed to the roiling of my innards and unleashed what was within.

Five kilometers ahead, an awful battle roiled, kicking up roars and billows of smoke, the smell on the breeze was explosives.

Dreadnought took them as far as Munueyn, a Ruined City fallen amongst the dark, thick gases of the lower atmosphere where slow coils of turbulence roiled past like the heavy, lascivious licks of an almighty planetary tongue, a place all spires and spindles, near-deserted, long unfashionable, a one-time Storm-Centre now too far from anything to be of much interest to anybody, a place that might have garnered kudos for itself had it been near a war zone, but could hope for almost none at all because it was within one.

He raised his voice, and the winds lashed us and the clouds roiled, the seas far below beating themselves in a frenzy against the cliffs.

The massive guard was lost from the waist down in a roiling curtain of silt, with each step sending silvery columns of loess shooting up past his head.