verb (used with object)
to render (water, wine, etc.) turbid by stirring up sediment.
to disturb or disquiet; irritate; vex: to be roiled by a delay.
verb (used without object)
to move or proceed turbulently.

1580–90; origin uncertain

unroiled, adjective

roil, royal.

2. annoy, fret, ruffle, exasperate, provoke, rile.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roil (rɔɪl)
1.  (tr) to make (a liquid) cloudy or turbid by stirring up dregs or sediment
2.  (intr) (esp of a liquid) to be agitated or disturbed
3.  dialect (intr) to be noisy or boisterous
4.  (tr) another word (now rare) for rile
[C16: of unknown origin; compare rile]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590, probably from M.Fr. rouiller "to rust, make muddy," from O.Fr. rouil "mud, rust," from V.L. *robicula, from L. robigo "rust" (see robust). M.E. roil meant "to roam or rove about."
Online Etymology Dictionary, © 2010 Douglas Harper
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