octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• expediently
• expedients
• expeditate
• expeditated
• expeditates
• expeditating
• expeditation
• expeditations
• expedite
• expedited
• expeditely
• expediter
• expediters
• expedites
• expediting
• expedition
• expeditionary
• expeditions
• expeditious
• expeditiously
• expeditiousness
• expeditiousnesses
• expeditive
• expeditor
• expeditors