vapor

Vapor is a gas or moisture floating in the air.

(noun)

An example of vapor is fog.

Vapor is defined as to give off gas or water moisture.

(verb)

An example of vapor is for water to give off steam when it boils.

See vapor in Webster's New World College Dictionary

noun

1. visible particles of moisture floating in the air, as fog, mist, or steam
2. any cloudy or imperceptible exhalation, as smoke or noxious fumes
the gaseous form of any substance which is usually a liquid or a solid
1. any substance vaporized for use in machinery, medical therapy, etc.
2. a mixture of such a vaporized substance with air, as the explosive mixture in an automotive cylinder
Now Rare anything insubstantial or worthless
Archaic
1. exhalations from the stomach believed to be harmful to one's health
2. hypochondria or depressed spirits: often with the

Origin: ME vapour < Anglo-Fr < MFr vapeur < L vapor < IE base *wep-, to give off vapors

intransitive verb

transitive verb

vaporize

Related Forms:

See vapor in American Heritage Dictionary 4

noun

Barely visible or cloudy diffused matter, such as mist, fumes, or smoke, suspended in the air.
a. The state of a substance that exists below its critical temperature and that may be liquefied by application of sufficient pressure.
b. The gaseous state of a substance that is liquid or solid under ordinary conditions.
a. The vaporized form of a substance for use in industrial, military, or medical processes.
b. A mixture of a vapor and air, as the explosive gasoline-air mixture burned in an internal-combustion engine.
Archaic
a. Something insubstantial, worthless, or fleeting.
b. A fantastic or foolish idea.
vapors Archaic
a. Exhalations within a bodily organ, especially the stomach, supposed to affect the mental or physical condition. Used with the.
b. A nervous disorder such as depression or hysteria. Used with the.