noun, plural quar·tos.
Origin of quarto
Examples from the Web for quarto
When Moore's Life of Byron first appeared, it was in two large, quarto volumes, and the first came out alone.Library Notes|A. P. Russell
The bands are also stretched upon the sewing frame; for folio, at least six are used, and for quarto not less than four.Practical Bookbinding|Paul Adam
I cannot give a positive answer without reading about seven large volumes in quarto of taxing laws.Cottage Economy|William Cobbett
Published in quarto size, handsome cloth binding, and sent to any address for $1.50.
In all editions before the quarto of 1743, "Some the French writers."The Works of Alexander Pope, Volume 2 (of 10)|Alexander Pope