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
Because most ozone-depleting substances are also potent greenhouse gases, the treaty’s measures from 1990 to 2010 alone have prevented the equivalent of 11 gigatons of CO2 emissions into the atmosphere per year.
—
Big Think, 31 Mar. 2026
The 2023 ozone projection inventory reflects that cars and trucks account for about 21% of the manmade VOC plus oxides of nitrogen emissions in the air that contribute to the formation of ground-level ozone or 'smog' during the summer months.
—Keith Laing, USA Today, 30 Mar. 2026
The entire process, called IV ozone therapy, takes nearly an hour.
—Shay Castle, Denver Post, 30 Mar. 2026
Despite air quality improvements over the last 20 years, many parts of southeastern Wisconsin still don't reach federal ozone standards, according to a state report.
—Hope Karnopp, jsonline.com, 30 Mar. 2026
See All Example Sentences for ozone
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Big Think, 31 Mar. 2026
The 2023 ozone projection inventory reflects that cars and trucks account for about 21% of the manmade VOC plus oxides of nitrogen emissions in the air that contribute to the formation of ground-level ozone or 'smog' during the summer months.
—Keith Laing, USA Today, 30 Mar. 2026
The entire process, called IV ozone therapy, takes nearly an hour.
—Shay Castle, Denver Post, 30 Mar. 2026
Despite air quality improvements over the last 20 years, many parts of southeastern Wisconsin still don't reach federal ozone standards, according to a state report.
—Hope Karnopp, jsonline.com, 30 Mar. 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 3 Apr. 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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