Webster's English Dictionary

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dreg

dreg \'dreg\ n [ME, fr. ON dregg; akin to L fraces dregs of oil, Gk 
   thrasseinX to trouble 1: sediment contained in a liquid or precipitated 
   from it : LEES m usu. used in pl. 2: the most undesirable part - usu. used 
   in pl.  3: the last remaining part : VESTIGE