»A rough drawing or delineation of something, giving the outlines or prominent features without the detail, esp. one intended to serve as the basis of a more finished picture, or to be used in its composition; a rough draught or design« (Oxford English Dictionary 21989, S. 593); a preliminary drawing, in medieval manuscripts typically for a illumination or initial.
The Oxford English Dictionary / Simpson, J. A. (Bearb.) ; Weiner, E. S. C. (Bearb.). Bd. 1–20. 2. Aufl. Oxford : Clarendon Press, 1989. – ISBN 978-0-19-861186-8, S. 593 (↪ Eintrag im Katalogverbund K10plus)