water vapor
noun
a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.
Compare steam(def 2).
Origin of water vapor
First recorded in 1875–80
Words nearby water vapor
water trap,
water treatment,
water tube boiler,
water turbine,
water turkey,
water vapor,
water vapour,
water vole,
water wagon,
water wagtail,
water wave
Example sentences from the Web for water vapor
Scientific definitions for water vapor
water vapor
Water in its gaseous state, especially in the atmosphere and at a temperature below the boiling point. Water vapor in the atmosphere serves as the raw material for cloud and rain formation. It also helps regulate the Earth's temperature by reflecting and scattering radiation from the Sun and by absorbing the Earth's infrared radiation. See also vapor.