| ozone | a colorless gas (O3) soluble in alkalis and cold water |
|---|---|
| ozone | an area of the ozone layer (near the poles) that is seasonally depleted of ozone |
| ozone | a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun |
| ozone | illness that can occur to persons exposed to ozone in high-altitude aircraft |