weedkiller
- n a chemical agent that destroys plants or inhibits their growth
- The trouble was caused, he said, by 2,4-D (2,4-dichlorophenoxyacetic acid) the miracle weedkiller (PTI, June 30).
- Monsanto sells glyphosate under the name Roundup and a variety of seeds resistant to the weedkiller as Roundup Ready.
- The old reliable weedkiller roams again.