Merriam-Webster Collegiate Dictionary - packthread

 noun  Date: 14th century strong thread or small twine used for sewing or tying packs or parcels PACLITAXEL  noun  Etymology: Pacific yew + -litax- (perhaps from Taxus brevifolia) + -el (alteration of 1-ol or 3-ol)  Date: 1992 an antineoplastic drug C47H51NO14 originally derived from the bark of the Pacific yew but now typically derived as a semisynthetic product of the English yew and used to treat ovarian cancer