twelvemos
/ˈtwɛlvmoʊz/
noun
- A book size in which each leaf is one-twelfth of a standard printing sheet, typically about 5 by 7.5 inches (12mo).
- The publisher printed the novel in a compact twelvemo format.
- She prefers reading twelvemos because they fit easily in her bag.
- The library has a rare collection of twelvemos from the 18th century.