凸版 (tū bǎn) literally means 'protruding plate' — 凸 (tū) means 'convex' or 'projecting outward', and 版 (bǎn) means 'plate', 'block', or 'printing surface'. Together, they refer specifically to a relief printing plate: a raised surface used in traditional printing methods like woodblock or letterpress, where ink is applied to the raised areas and transferred to paper. This term is technical but appears in art, publishing, and cultural history contexts, especially when discussing traditional Chinese printmaking or early book production.

In modern usage, 凸版 is less common in everyday speech but remains essential in graphic design, museum studies, and preservation work. It contrasts with other printing plates such as 凹版 (āo bǎn, intaglio plate) and 平版 (píng bǎn, planographic/lithographic plate). While historically linked to woodblock printing of texts and illustrations — including botanical or agricultural manuals — it’s not inherently tied to plants, though such prints often featured plant motifs.