Definitions

1. noun

A person or thing that infests, especially a plant or animal that is a pest.

“The infestant in the field was a common weed that grew rapidly and competed with the crops for water and nutrients.”

2. verb

To infest or be infested with pests, especially insects or weeds.

“The garden infested with aphids, and the farmer had to take drastic measures to get rid of them.”