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ozone.

An allotrope of oxygen (symbol O₃) having three atoms in the molecule instead of the usual two; it is a toxic gas, generated from oxygen by electrical discharge.

5 characters2 syllables approx.English language

Meaning & usage

noun/ˈəʊzəʊn/Received-Pronunciation/ə(ʊ)ˈzəʊn/Received-Pronunciation, obsolete/ˈoʊzoʊn/General-American
  1. An allotrope of oxygen (symbol O₃) having three atoms in the molecule instead of the usual two; it is a toxic gas, generated from oxygen by electrical discharge.

    uncountable · usually
  2. Fresh air, especially that breathed at the seaside and smelling of seaweed.

    UK · informal · uncountable · usually
Where this word comes from

From German Ozon, coined 1840 by Christian Friedrich Schönbein, from Ancient Greek ὄζον (ózon), neuter participle of ὄζω (ózō, “I smell”), in reference to its pungent odour. The “fresh air” sense is from an erroneous former belief that seaweed contains and releases ozone.

verb/ˈəʊzəʊn/Received-Pronunciation/ə(ʊ)ˈzəʊn/Received-Pronunciation, obsolete/ˈoʊzoʊn/General-American
  1. To treat with ozone.

    transitive
Where this word comes from

From German Ozon, coined 1840 by Christian Friedrich Schönbein, from Ancient Greek ὄζον (ózon), neuter participle of ὄζω (ózō, “I smell”), in reference to its pungent odour. The “fresh air” sense is from an erroneous former belief that seaweed contains and releases ozone.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.