octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• Inland Revenue
• inlands
• in-law
• in-laws
• inlay
• inlayer
• inlayers
• inlaying
• inlayings
• inlays
• in league with
• inlet
• inlets
• inlier
• inliers
• in limine
• in line
• in-line
• in-line skate
• in-line skates
• in-line skating
• in Lipsburie pinfold
• in liquor
• in little
• in living memory