octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• braining
• brainish
• brainless
• brainlessly
• brainlessness
• brainlessnesses
• brain-pan
• brainpan
• brainpans
• brainpower
• brainpowers
• brains
• brainsick
• brainsickly
• brainsickness
• brainsicknesses
• brainstem
• brainstems
• brainstorm
• buccinatory
• Buccinum
• bucellas
• bucellases
• Bucentaur
• Bucephalus