noun
old woodblock-printed book (Muromachi period or earlier)
Refers specifically to books printed using woodblocks during the Muromachi period or earlier; a historical and bibliographic term.
この図書館には貴重な古版本が所蔵されている。
This library holds valuable old woodblock-printed books.
古版本の研究は、日本の印刷史を理解する上で重要だ。
The study of old woodblock-printed books is important for understanding the history of printing in Japan.
Compound of 古 (old) + 版本 (woodblock-printed book). The reading こはんぽん follows standard on'yomi. The variant こはんぼん is a common rendaku voicing.