octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• passenger
• passenger-mile
• passenger-miles
• passenger-pigeon
• passenger-pigeons
• passengers
• passe-partout
• passepied
• passepieds
• passer
• passer-by
• Passeres
• multilingual
• multilingualism
• multilinguist
• multilinguists
• multilobate
• multilobed
• multilobular
• multilobulate
• multilocational
• multilocular
• multiloculate
• multiloquence
• multiloquences