folio

folio
[ˈfəʊlɪəʊ]
(pl. -os)
  1. an individual leaf of paper or parchment, either loose as one of a series or forming part of a bound volume, which is numbered on the recto or front side only
    (仅在正面标号的)一张纸;一张羊皮纸书稿
    ■the page number in a printed book
    (书的)页码
    ■a sheet of paper folded once to form two leaves (four pages) of a book
    对折纸,对开纸
    ■a size of book made up of such sheets
    对开本
    imperial folio.
    皇家对开本。
    copies in folio.
    对开本书册。
    ■a book or manuscript made up of sheets of paper folded in such a way; a volume of the largest standard size
    对开本书(或抄本);最大号对开本
    old vellum-bound folios.
    古老的犊皮装订对开本。
    [as modifier]a folio volume.
    一个对开本。
语源
  1. late Middle English: from Latin, ablative of folium 'leaf', in medieval Latin used in references to mean on leaf so-and-so'. The original sense of in folio (from Italian in foglio) was 'in the form of a full-sized sheet or leaf folded once' (designating the largest size of book)
英语宝典
考试词汇表