Webster's English Dictionary

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roil

Cross references:
  1. irritate              
 
roil \'ro.i(*)l, vt 2 is also 'ri-(*)l\ vb [origin unknown] 1a: to make 
   turbid by stirring up the sediment or dregs of  1b: to stir up : DISTURB, 
   DISORDER  2: RILE  : to move turbulently