folio

US /ˈfoʊ.li.oʊ/
UK /ˈfoʊ.li.oʊ/
"folio" picture
1.

对开页, 页

a leaf of a manuscript or book, numbered only on the front (recto) side

:
The ancient manuscript had several missing folios.
这份古老的手稿有几页对开页缺失。
Each folio was carefully preserved to prevent damage.
每一页对开页都经过精心保存以防止损坏。
2.

对开本, 大开本

a book or manuscript of the largest size, made from sheets of paper folded once

:
The library acquired a rare first edition folio.
图书馆购得一本珍贵的初版对开本
Shakespeare's First Folio is a collection of his plays.
莎士比亚的《第一对开本》是他的戏剧集。