Source : Webster's Revised Unabridged Dictionary (1913)

Betony \Bet"o*ny\, n.; pl. {Betonies}. [OE. betony, betany, F.
   betoine, fr. L. betonica, vettonica.] (Bot.)
   A plant of the genus {Betonica} (Linn.).

   Note: The purple or wood betony ({B. officinalis}, Linn.) is
         common in Europe, being formerly used in medicine, and
         (according to Loudon) in dyeing wool a yellow color.