Herbicide (noun)

1. A substance that is used to kill or control the growth of plants, especially weeds.
2. A chemical that is used to destroy unwanted plants in an agricultural or horticultural setting.

Origin:

From the word "herb" + "-cide" meaning the killing of plants.

Examples:

1. Farmers use herbicides to protect their crops from weeds and other unwanted plants.
2. The use of herbicides has increased in recent years, leading to concerns about their environmental impact.
3. Herbicides are used to control weeds in gardens and lawns.
4. Herbicides can be selective, killing only certain types of plants, or non-selective, killing all plants.
5. Herbicides are widely used in agriculture, forestry and horticulture, to protect crops and forests from unwanted plants.