Webster's English Dictionary

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rue

1. rue \'ru:\ vb [ME ruen, fr. OE hre-owan; akin to OHG hriuwan to regret] 
   : to feel penitence, remorse, or regret for  : to feel sorrow, regret, or 
   remorse 
2. rue n : REGRET, SORROW 
3. rue n [ME, fr. MF, fr. L ruta, fr. Gk rhyte-] : a strong-scented 
   perennial woody herb (Ruta graveolens of the fami ly Rutaceae, the rue 
   family) that has bitter leaves used in medicine and is related to the 
   citrus