noun
Technical term in bibliography and computing for books printed before 1501, using movable type. Rare outside specialized contexts.
図書館は貴重な初期刊本をデジタル化している。
The library is digitizing valuable incunabula.
Compound of 初期 (early period) and 刊本 (printed book). The term is a direct translation of the Latin 'incunabulum'.