Octodecimo is a book size which refers to a publication that has been printed on paper that has been folded into 18 leaves or 36 pages. The term octodecimo comes from the Latin words “octo” for eighteen and “decimo” for ten, indicating the number of leaves in the book. This format was popular in the 16th and 17th centuries for small, portable books that could easily fit in a pocket or purse.
Octodecimo books were often used for works of literature, poetry, and religious texts. Due to their small size, they were also practical for travelers or individuals who wanted to carry a book with them for reading on the go. The compact nature of octodecimo books also made them more affordable and accessible to a wider range of readers.
Today, octodecimo books are less common as larger formats have become more popular for publishing. However, they still hold a place in the history of book production and are valued for their historical significance. Collectors and bibliophiles may seek out octodecimo editions for their rarity and unique charm.