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Medical Definition of Rhatanhy
1. The powerfully astringent root of a half-shrubby Peruvian plant (Krameria triandra). It is used in medicine and to colour port wine. Alternative forms: ratany] Savanilla rhatany, the root of Krameria Ixina, a native of new Granada. Origin: Sp. Ratania, ratana, Peruv. Ratana. Source: Websters Dictionary (01 Mar 1998)