1. plural of twelvemo; books printed in a format where each sheet is folded to make twelve leaves
Usage: printing; archaic

Examples

• The library’s rare book collection included several twelvemos from the 18th century.
• Publishers often chose twelvemos for portable editions of popular novels.
• The bookbinder specialized in restoring damaged twelvemos.
• These twelvemos were more affordable than larger format books.
• Collectors prize well-preserved twelvemos from famous authors.