D defs.my
Entry 2 senses · 2 variants Webster, 1913

Quarto

/kwôr'-tō/ · Quar·to · IPA /kwˈɔrtoʊ/
01 a. Having four leaves to the sheet; of the form or size of a quarto.
  1. 1.
    Having four leaves to the sheet; of the form or size of a quarto.
02 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 squa…
pl. Quartos
  1. 1.
    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.