1. a substance that propels or drives something forward, especially fuel for rockets or gas for aerosol sprays

1. having the power to propel or drive forward

Examples

• The rocket used liquid propellant to reach orbit.
• Aerosol cans contain propellant gas to spray the contents.
• Scientists developed a new propellant for spacecraft engines.
• The propellant force launched the missile into the sky.
• Hair spray requires propellant to create the fine mist.
• The propellant charge fired the projectile from the cannon.