This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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

n. A book composed of pages of this size.

n. 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).

n. A book size, corresponding to the paper size.

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

n. 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.

n. 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.

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

"They form six volumes in quarto; and as Basil is the worst, so"

size   

broad quarto    small quarto    foolscap   

Q    4to    4°   

Porto   

octavo    duodecimo    folio    deste    tyro    memento    quinto    consulatu    black-letter    4to