Definition of ozone

Definition of ozone
  1. ozone Noun An allotrope of oxygen ("symbol" O3) having three atoms in the molecule instead of the usual two; it is a blue gas, generated from oxygen by electrical discharge; it is poisonous and highly reactive, but in the upper atmosphere it protects life on Earth from ultraviolet radiation.
  2. ozone Noun ("informally but erroneously") Fresh air, especially that breathed at the seaside and smelling of seaweed.
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