(paper) A size of paper (7.5"-10" x 10"-12.5" or 190-254 x 254-312 mm). Formed by folding and cutting one of several standard sizes of paper (15"-20" x 20"-25" or 381-508 x 508-635 mm) twice to form 4 leaves (eight sides).

plural of quarto

(paper) A paper size, (1.87"-2.5" x 2.5"-3.125"), one sixty-fourth of a standard uncut flat sheet. / (printing) A book size, (1.87"-2.5" x 2.5"-3.125"), corresponding to the paper size.

(paper) A paper size, (2.5-3.3" x 5"-6.25"), one twenty-fourth of a standard uncut flat sheet. / (printing) A book size, (2.5"-3.3" x 5"-6.25"), corresponding to the paper size.

plural of sexagesimo-quarto

(printing) Formed of sheets folded so as to make twenty-four leaves.

plural of bad quarto

A quarto-sized publication of a play, especially a Shakespearean play, that is considered spurious by virtue of having been copied down during a performance or later reconstructed from memory.

The doctrines of the Quartodecimans.

plural of Quartodeciman