Source : Webster's Revised Unabridged Dictionary (1913)

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 resinifrea. It was
   formerly employed medicinally, but was found so violent in
   its effects that its use is nearly abandoned.

Source : WordNet®

euphorbium
     n : an acrid brown gum resin now used mainly in veterinary
         medicine [syn: {gum eurphorbium}]