Webster's English Dictionary

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vervain

ver.vain \'v*r-.va-n\ n [ME verveine, fr. MF, fr. L verbena, sing. of 
   verbenae sacred] boughs, certain medicinal plants; akin to L verber rod, Gk 
   rhabdos : any of a genus (Verbena of the family Verbenaceae, the vervain 
   fam ily) of plants; esp : one with small spicate flowers