1
: a triatomic very reactive form of oxygen that is a bluish irritating gas of pungent odor, that is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere, and that is used for oxidizing, bleaching, disinfecting, and deodorizing
2
: pure and refreshing air
relished the ozone of morning
Examples of ozone in a Sentence
Scientists are concerned about ozone depletion.
A light breeze filled the rooms of our seaside cottage with ozone.
Recent Examples on the Web
When aimed at fabrics, the plasma generates reactive oxygen species such as ozone.
—
Chris Young, Interesting Engineering, 2 June 2026
The treatment plant is supposed to combat this problem, using screens and sand to filter the water and a system that infuses the water with ozone gas, which kills algae and bacteria.
—New York Times, 31 May 2026
Formaldehyde is a common pollutant that adds to ozone smog and harms human health.
—Doyle Rice, USA Today, 31 May 2026
Atmospheric conditions are expected to be favorable for producing high levels of ozone air pollution in the Dallas-Fort Worth area on Monday.
—Star-Telegram Weather Bot, Fort Worth Star-Telegram, 31 May 2026
See All Example Sentences for ozone
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Chris Young, Interesting Engineering, 2 June 2026
The treatment plant is supposed to combat this problem, using screens and sand to filter the water and a system that infuses the water with ozone gas, which kills algae and bacteria.
—New York Times, 31 May 2026
Formaldehyde is a common pollutant that adds to ozone smog and harms human health.
—Doyle Rice, USA Today, 31 May 2026
Atmospheric conditions are expected to be favorable for producing high levels of ozone air pollution in the Dallas-Fort Worth area on Monday.
—Star-Telegram Weather Bot, Fort Worth Star-Telegram, 31 May 2026
See All Example Sentences for ozone
Cite this Entry
“Ozone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ozone. Accessed 5 Jun. 2026.
Copy CitationKids Definition
ozone
noun1
: a form of oxygen that is a bluish irritating sharp-smelling gas containing three atoms per molecule, and that is used especially in disinfecting, deodorizing, and bleaching
2
: pure and refreshing air
Medical Definition
ozone
noun
: a triatomic very reactive form of oxygen that is a bluish irritating gas of pungent odor, that is formed naturally in the atmosphere by a photochemical reaction and is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere, and that is used for oxidizing, bleaching, disinfecting, and deodorizing
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