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From The Collaborative International Dictionary of English v.0.48:
Vellum \Vel"lum\, n. [OE. velim, F. v['e]lin, fr. L. vitulinus of a calf, fr. vitulus a calf. See Veal.] A fine kind of parchment, usually made from calfskin, and rendered clear and white, -- used as for writing upon, and for binding books. [1913 Webster] Vellum cloth, a fine kind of cotton fabric, made very transparent, and used as a tracing cloth. [1913 Webster]