paclitaxel
pac·li·tax·el
noun \ˌpak-li-ˈtak-səl\Definition of PACLITAXEL
: an antineoplastic agent C47H51NO14 that was originally derived from the bark of a yew tree (Taxus brevifolia of the family Taxaceae) of the western United States and British Columbia but that is now typically derived as a semisynthetic product of the English yew (T. baccata) and is used to treat ovarian cancer which has not responded to conventional chemotherapy—see taxol
