octodecimo /ok-tō-desˈi-mō/

1. Having eighteen leaves to the sheet
2. Contracted 18mo, often read eighteenmo

A book with sheets so folded

• highering
• higher mathematics
• highermost
• highers
• higher-up
• higher-ups
• highest
• high explosive
• high-explosive
• high explosives
• highfalutin
• highfaluting
• high fashion
• high fashions
• high feather
• high-fed
• high-feeding
• high fidelity
• high-fidelity
• high five
• high-five
• high-fived
• high fives
• high-fives
• high-five-sign