1911 Encyclopædia Britannica/Quarto

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QUARTO, 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.