The state or feeling of being empty.
A void; a nothingness; something lacking existence.
A nonexistence; a lack of existence.
Fresh air, especially that breathed at the seaside and smelling of seaweed.
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.
Hypernym: greenhouse gas
To treat with ozone.