The Collaborative International Dictionary of English v.0.48:

Taxine \Tax"ine\, n. [L. taxus a yew.] (Chem.)
   A poisonous alkaloid of bitter taste extracted from the
   leaves and seeds of the European yew (Taxus baccata).
   Called also taxia. The usual preparation is a mixture of
   compounds. Taxine A has the chemical formula: C35H47NO10.
   [1913 Webster +PJC]