mandrel or mandril /manˈdrəl/

1. A bar of iron fitted to a turning-lathe on which articles to be turned are fixed
2. The axle of a circular saw
3. A miner's pick

• octahedron
• octahedrons
• octal
• octals
• octamerous
• octameter
• octameters
• Octandria
• octandrian
• octandrous
• octane
• octane number
• octane numbers
• octane rating
• octane ratings
• octanes
• octangular
• Octans
• octant
• octantal
• octants
• octapla
• octaploid
• octaploidies
• octaploids