Definition of vapor

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< vapid

vapor density >

va·por    (vpr) KEY  

NOUN:

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

VERB:
va·pored , va·por·ing , va·pors
VERB:
tr.

To vaporize.

VERB:
intr.

1. To give off vapor.
2. To evaporate.
3. To engage in idle, boastful talk.

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ETYMOLOGY:
Middle English vapour, from Anglo-Norman, from Latin vapor

OTHER FORMS:
vapor·er (Noun)

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