You searched for: “quarto
A shortened form of Latin in quarto, "in a fourth"; that is, 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.

This entry is located in the following unit: quatr-, quart- (page 2)