quarto

The page size obtained by folding a whole sheet into four leaves.

A book composed of pages of this size.

A size of book in which the leaf is one fourth of a described or implied size of paper.

Noting the size of a book in which a sheet makes four leaves: as, a quarto volume; being of the size or shape of the leaves of a quarto; as, quarto paper; a quarto edition.

Having four leaves to the sheet; of the form or size of a quarto.

Originally, a book of the size of the fourth of sheet of printing paper; a size leaves; in present usage, a book of a square or nearly square form, and usually of large size.

A size of paper (7.5″-10″ x 10″-12.5″)(190-254 x 254-312 mm). Formed by folding and cutting one of several standard sizes of paper (15″-20″ x 20″-25″)(381-508 x 508-635 mm) twice to form 4 leaves (eight sides).

A book size, corresponding to the paper size.

the size of a book whose pages are made by folding a sheet of paper twice to form four leaves