Source : Webster's Revised Unabridged Dictionary (1913)

Rhatany \Rhat"a*ny\, Rhatanhy \Rhat"an*hy\, n. [Sp. ratania,
   rata[~n]a, Peruv. rata[~n]a.]
   The powerfully astringent root of a half-shrubby Peruvian
   plant ({Krameria triandra}). It is used in medicine and to
   color port wine. [Written also {ratany}.]

   {Savanilla rhatany}, the root of {Krameria Ixina}, a native
      of New Granada.