1. A book size resulting from folding a sheet of paper three times to form eight leaves; also, a book of this size.
Usage: Also spelled 'octavo' (the more common modern spelling).; Printing and publishing term.; Abbreviated as 8vo.

Examples

• The rare manuscript was bound in eightvo format.
• Libraries often catalog eightvo volumes separately from larger folios.
• This eightvo edition from the 18th century is quite valuable to collectors.