Bible Encyclopedias
Quarto
1911 Encyclopedia Britannica
a shortened form of Lat. in quarto, " in a fourth," i.e. of a sheet of paper, applied to a size of paper, and to a size of a printed volume. Paper is in quarto when a whole single sheet is folded twice so as to form four leaves; a book is technically termed of "quarto" size when made up of sheets folded twice.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Quarto'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​q/quarto.html. 1910.