rue (n.1)youdaoicibaDictYouDict[rue 词源字典]
perennial evergreen shrub, late 14c., from Old French rue (13c.), earlier rude, from Latin ruta "rue," probably from Greek rhyte, of uncertain etymology, originally a Peloponnesian word. The bitter taste of its leaves led to many punning allusions to rue (n.2.).[rue etymology, rue origin, 英语词源]