octodecimo /ok-tō-desˈi-mō/

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

A book with sheets so folded

• spheroidized
• spheroidizes
• spheroidizing
• spheroids
• spherometer
• spherometers
• spherular
• spherule
• spherules
• spherulite
• spherulites
• spherulitic
• sphery
• sphincter
• sphincteral
• sphincterial
• sphincteric
• sphincters
• sphinges
• Sphinges
• sphingid
• sphingids
• sphingomyelin
• sphingomyelins
• sphingosine