sextodecimo
/ˌsekstəʊˈdesɪməʊ/(缩略词： 16mo)
noun
(pl. -os)
1- a size of book page that results from folding each printed sheet into sixteen leaves (thirty-two pages)（书页）十六开本。
1.1
- a book of this size.十六开本的书。
词源
late 17th cent.: from Latin sexto decimo, ablative of sextus decimus 'sixteenth'.