1. serving to drive out or expel; having the power to expel or force out
Usage: formal or technical

1. a substance or agent that expels or drives out something, especially an insect repellent
Usage: often used in compounds like 'insect expellent'

Examples

• The expellent properties of the chemical made it effective at removing pests.
• Citronella is a natural expellent used to keep mosquitoes away.
• The expellent force of the explosion scattered debris across the field.
• Many plants produce expellent compounds to protect themselves from insects.
• The device works as an expellent, driving rodents out of the building.