déparasiter

To rid something of parasites — most commonly used of treating a pet or farm animal against fleas, worms, or lice (déparasiter un chien), though it can extend to plants in looser use. Vermifuger is the closer, narrower term specifically for deworming.

• Le vétérinaire recommande de déparasiter le chat tous les trois mois. — The vet recommends treating the cat for parasites every three months.
• Il faut déparasiter les rosiers avant le printemps. — The rose bushes need to be treated for parasites before spring.
• Cette pipette déparasite le chien en une seule application. — This pipette treats the dog for parasites in a single application.

Mostly heard in veterinary and gardening contexts — don't confuse it with désinfecter (to disinfect), which is about germs and bacteria rather than parasites like fleas or worms.

Often confused with désinfecter.