Weedkiller (noun)

A chemical or other substance used to kill or control the growth of weeds.

Origin:

The word weedkiller is a combination of the words "weed" and "killer" meaning a substance or agent used to destroy unwanted plants.

Examples:

1. The farmer sprayed the field with weedkiller to get rid of the unwanted plants.
2. I'm going to buy a weedkiller to use on my lawn.
3. The weedkiller was effective in getting rid of the dandelions.
4. I accidentally spilled some weedkiller on my shoe.
5. The city uses weedkiller to keep sidewalks and median strip free of weeds.