vel·lum 
(vĕləm)
(vĕləm)n.
1.
a. A fine parchment made from calfskin, lambskin, or kidskin and used for the pages and binding of books.
b. A work written or printed on this parchment.
2. A heavy off-white fine-quality paper resembling this parchment.
[Middle English velim, from Old French velin, from veel, calf; see VEAL.]