Definitions

1. adjective

relating to or capable of destroying pests, especially insects or weeds

“The farmer applied a pesticidal spray to the crops to protect them from aphids.”

2. adjective

causing or relating to the death of pests, especially insects or weeds

“The pesticidal effect of the chemical lasted for several days.”

3. noun

a substance that kills pests, especially insects or weeds

“The pesticidal agents in the new pesticide were more effective than the old one.”