ozone

  1. Noun.  (chemistry) 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. Noun.  (context, from an erroneous former belief that seaweed contains and releases ozone) Fresh air, especially that breathed at the seaside and smelling of seaweed.

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This entry was last updated on RefTopia from its source on 3/20/2012.