octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• felstone
• felstones
• felt
• felted
• felter
• feltered
• feltering
• felters
• feltier
• feltiest
• felting
• feltings
• felt pen
• felt pens
• felts
• felt tip
• felt-tipped pen
• felt-tipped pens
• felt-tip pen
• felt-tip pens
• felt tips
• felty
• felucca
• feluccas
• felwort