ozone ( synonym found)
Definition of ozone:

(n) : 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; (informally but erroneously) Fresh air, especially that breathed at the seaside and smelling of seaweed
Definition of ozone:

(n) : 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; (informally but erroneously) Fresh air, especially that breathed at the seaside and smelling of seaweed
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