The Collaborative International Dictionary
Vellum cloth
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.
Vellum cloth, a fine kind of cotton fabric, made very transparent, and used as a tracing cloth.
Wiktionary
vellum cloth
n. A fine kind of cotton fabric, made very transparent, and used as a tracing cloth.