To treat with 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.
Hypernym: greenhouse gas
Fresh air, especially that breathed at the seaside and smelling of seaweed.
To apply a surface to something.
To make (information or facts) known.
To become known or apparent; to appear or be found.
To provide something with a surface.
To bring to the surface.
To come out of hiding.
To work a mine near the surface.
To rise to the surface.
Outward or external appearance.
The outside hull of a tangible object.
The overside or up-side of a flat object such as a table, or of a liquid.
The locus of an equation (especially one with exactly two degrees of freedom) in a more-than-two-dimensional space.