Euphorbia resinifera

from The Collaborative International Dictionary of English v.0.48

Euphorbium \Eu*phor"bi*um\, n. [NL., fr. L. euphorbeum, from Gr.
   ?; -- so called after Euphorbus, a Greek physician.] (Med.)
   An inodorous exudation, usually in the form of yellow tears,
   produced chiefly by the African {Euphorbia resinifera}. It
   was formerly employed medicinally, but was found so violent
   in its effects that its use is nearly abandoned.
   [1913 Webster]