Term used to describe moisture laden air.
Merriam-Webster Online Dictionary
vapor (noun)1.
diffused matter (as smoke or fog) suspended floating in the air and impairing its transparency
2.
a) a substance in the gaseous state as distinguished from the liquid or solid state
b) a substance (as gasoline, alcohol, mercury, or benzoin) for industrial, therapeutic, or military uses - vaporized , also a mixture (as the explosive mixture in an internal combustion engine) of such a vapor with air
3.
a) something unsubstantial or transitory - phantasm
b) a foolish or fanciful idea
4.
a) archaic exhalations of bodily organs (as the stomach) held to affect the physical or mental condition
b) a depressed or hysterical nervous condition
intransitive verb
1.
a) to rise or pass off in vapor
b) to emit vapor
2.
to indulge in bragging, blustering, or idle talk