1. serving to drive out or expel; having the power to force something away or out
Usage: often used in medical or scientific contexts

1. a substance or agent that drives out or expels something, especially a gas or vapor
Usage: technical term used in chemistry and aerosol products

Examples

• The expellant force of the explosion pushed debris across the field.
• Aerosol cans use an expellant gas to spray their contents.
• The medication has expellant properties that help clear mucus from the lungs.
• An expellant was added to the mixture to ensure complete discharge.
• The expellant action of the pump forced water through the system.
• Scientists studied the expellant effects of the chemical compound.