octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• arithmometers
• arithmophobia
• arithmophobias
• a rivederci
• Ariz.
• ark
• Ark.
• arked
• arking
• arkite
• arkose
• arkoses
• arks
• ark-shell
• ark-shells
• ARLA
• arle
• arled
• arle-penny
• arles
• arles-penny
• arling
• arm
• Arm.
• armada