A smooth board on which paper is placed for making drawings WordNet 3.0 & Open English WordNet

A drawing board is, in its antique form, a kind of multipurpose desk which can be used for any kind of drawing, writing or impromptu sketching on a large sheet of paper or for reading a large format book or other oversized document or for drafting precise technical illustrations. Wikipedia

Desk used to produce technical drawings and architectural drawings Wikidata

A plane surface or table to which paper can be fastened for drawing purposes. Wiktionary

Plane surface or table to which paper can be fastened for drawing purposes. Wiktionary (translation)