The Collaborative International Dictionary of English v.0.48:

Cundurango \Cun`du*ran"go\ (k?n`d?-r?n"g?), n. (Med.)
   The bark of a South American vine (Gonolobus Condurango) of
   the Milkweed family. It has been supposed, but erroneously,
   to be a cure for cancer. [Written also condurango.]
   [1913 Webster]