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countable and uncountable, plural quartos
(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).
(UK) Quarto writing paper (10 inches x 8 inches) examples
(printing) A book size, corresponding to the paper size. quotations examples
Beneath an old ebony table were two long carved oak chests. I lifted the lid of one, and at the top was a once-white surplice covered with dust, and beneath was a mass of tracts — Commonwealth Quartos, unbound — a prey to worms and decay.
1880, William Blades, The Enemies of Books, page 40