twelvemo
/ˈtwɛlvmoʊ/
noun
- A book size resulting from folding a sheet of paper into twelve leaves (twenty-four pages), typically about 5 by 7.5 inches.
- The publisher released the novel in a compact twelvemo format for easy travel.
- The library's rare book room has several twelvemo volumes from the 18th century.
- Collectors often look for first editions in twelvemo because of their small size.