1. a chemical substance used to kill or control unwanted plants or weeds

Examples

• The farmer applied herbicide to control weeds in the corn field.
• Many gardeners use herbicide to keep their lawns free of dandelions.
• The herbicide was effective against broadleaf weeds but didn’t harm the grass.
• Environmental groups are concerned about herbicide runoff into waterways.
• She chose an organic herbicide made from natural ingredients.
• The herbicide label warned users to wear protective clothing during application.