Medical Dictionary

vapor va·por (vā'pər)

  1. Barely visible or cloudy diffused matter, such as mist, fumes, or smoke, suspended in the air.

  2. The state of a substance that exists below its critical temperature and that may be liquefied by application of sufficient pressure.

  3. The gaseous state of a substance that is liquid or solid under ordinary conditions.

  4. The vaporized form of a medicinal preparation to be administered by inhalation.

  5. A mixture of a vapor and air, as an explosive mixture of gasoline and air burned in an internal-combustion engine.

  6. vapors Exhalations within an organ, especially the stomach, supposed to affect the mental or physical condition. No longer in technical use.

  7. vapors A nervous disorder such as depression or hysteria. No longer in technical use.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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