vellum/ˈveləm; `vɛləm/ n[U]1 fine parchment or bookbinding material made from calf, kid or lamb skin （用小牛皮或小羊皮制的）精制皮纸, 犊皮纸, 羊皮纸.2 smooth fine-quality writing-paper 质优而光滑的书写用纸.
牛津英汉双解词典