Quarto
Quarto , adjective
[Latin in quarto in fourth, from quartus the fourth: compare French (in) quarto. See Quart.]
Having four leaves to the sheet; of the form or size of a quarto.
Quarto ({not transcribed}) , noun
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.