(yoō) noun. 1. Any of several poisonous evergreen trees or shrubs of the genus Taxus, having scarlet cup-shaped seeds and flat needles that are dark green above and yellowish below, pokok yew. 2. The wood of any of these trees, especially the durable, fine-grained wood of the Old World species Taxus baccata, used in cabinetmaking and for archery bows, kayu yew.