rheum emodei

1 definition found

rheum emodei - Collaborative International Dictionary of English v.0.48 :

  Emodin \Em"o*din\, n. (Chem.)
     An orange-red crystalline substance, C15H10O5, obtained
     from the buckthorn, rhubarb, etc., and regarded as a
     derivative of anthraquinone; -- so called from a species of
     rhubarb (Rheum emodei).
     [1913 Webster]