A sheet of paper 7 to 10 inches (17-25 cm) high and 4.5 to 6 inches (11-15 cm) wide, the size varying with the large original sheet used to create it, made by folding the original sheet three times to produce eight leaves.
A book made of octavo pages.
the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves
