A surface for drawing or writing made from the skins of calves, goats and sheep
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While there is no sharp distinction between vellum and parchment, vellum is generally a finer quality than parchment, since it is made from younger hides and so is smoother and has fewer or finer hair follicles. Parchment, made from the skins of older animals, tends to be coarser.
Modern paper vellum (vegetable vellum) is a quite different synthetic material, used for a variety of purposes including plans and technical drawings.