DictionaryoctavoBook format
noun

octavo

ahk-TAY-voh/ɑːkˈteɪvəʊ/

A book format made by folding each sheet into eight leaves.

The printer folds each sheet into eight leaves for an octavo.

A simplified bookbinding study pairing one unfolded sheet bearing the crease pattern of three successive half-folds with its finished eight-leaf gathering.
Etymology

Latin “eighth” connects the name to a sheet folded into eight leaves. What began as a printer’s description of the folded sheet became the name of the resulting book format.

In context

Kieth Gray74:59
the form of the modern book each sheet of parchment would yield eight pages of an octavo volume
BBC The Secret History of Writing 1080p HDTV x265 AAC MVGroup org

More examples

  • The catalog lists the book's format as octavo.
  • An octavo has sixteen pages for every folded sheet.
  • The library owns two octavos printed in the same year.

Forms

octavo · octavos

Similar words

quarto
A format with four leaves per sheet rather than eight.
folio
A format with two leaves per sheet rather than eight.