taxine

from The Century Dictionary.

• Of or pertaining to the genus Taxus or the Taxaceæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any of several poisonous alkaloids that may be extracted from the leaves and seeds of the yew tree (Taxus baccata)