duodecimo
/ˌdjuːəʊˈdesɪməʊ/noun
(pl. -os)
1- a size of book in which each leaf is one twelfth of the size of the printing sheet（书的）十二开本。
1.1
- a book of this size十二开本的书。
词源
mid 17th cent.: from Latin （in） duodecimo 'in a twelfth', from duodecimus 'twelfth'.