ozone
nounUK /ˈəʊzəʊn/
US /ˈoʊzoʊn/
A gas in the air that helps protect us from the sun's strong rays.
The ozone layer high above Earth keeps us safe from harmful sunlight.
RELATED WORDS
OTHER MEANINGS
2. Fresh, clean air with a sharp smell, often near the sea or after a storm.
We breathed in the fresh ozone by the ocean.
3. A form of oxygen with three atoms instead of two, used to clean water and air.
The machine uses ozone to purify the drinking water.
4. A sharp, slightly bleach-like smell.
The air had a faint ozone smell after the lightning strike.