Octavo (noun)

A book or manuscript that is made up of eight leaves of paper or parchment, folded to form 16 pages.

Origin:

Late 16th century, from latin octavus "eighth", because it is made up of eight leaves.

Examples:

1. The book was printed in octavo format, it was small and easy to carry around.
2. The octavo edition was the most affordable version of the book.
3. The octavo format was commonly used for small books and pamphlets in the 18th and 19th centuries.
4. The octavo pages were easy to read and the text was clear and legible.
5. The octavo size is ideal for small libraries and personal collections.