spline /splīn/

1. A key to make a wheel and shaft revolve together
2. A thin strip or slat
3. A flexible instrument used in drawing curves

To put splines on

• rocket launchers
• rocket motor
• rocket plane
• rocket planes
• rocket range
• rocket ranges
• rocketries
• rocketry
• rockets
• rocket science
• rocket scientist
• rocket scientists
• rockfall
• rockfalls
• Rock fever
• rockfish
• rockfishes
• rock flour
• rock-forming
• rock garden
• rock gardens
• rock guano
• rock-hewn
• rockhopper
• rockhoppers