Английский разговорный словарь (основной) - quarto

ˈkwɔ:təu n. (pl. -os) Printing 1 the size given by folding a (usu. specified) sheet of paper twice. 2 a book consisting of sheets folded in this way. °Abbr.: 4to. øquarto paper paper folded in this way and cut into sheets. [L (in) quarto (in) the fourth (of a sheet), ablat. of quartus fourth]