octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• supercolumniation
• supercomputer
• supercomputers
• superconduct
• superconducted
• superconducting
• superconductive
• superconductivity
• superconductor
• superconductors
• superconducts
• superconfidence
• superconfident
• supercontinent
• supercontinents
• supercool
• supercooled
• supercooling
• supercools
• supercriminal
• supercriminals
• supercritical
• superdainty
• superdelegate
• superdelegates