| 1. | a visible exhalation, as fog, mist, steam, smoke, or noxious gas, diffused through or suspended in the air: the vapors rising from the bogs. |
| 2. | Physics. a gas at a temperature below its critical temperature. |
| 3. | a substance converted into vapor for technical or medicinal uses. |
| 4. | a combination of a vaporized substance and air. |
| 5. | gaseous particles of drugs that can be inhaled as a therapeutic agent. |
| 6. | Archaic.
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| 7. | vapors, Archaic.
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| 8. | to cause to rise or pass off in, or as if in, vapor; vaporize. |
| 9. | Archaic. to affect with vapors; depress. |
| 10. | to rise or pass off in the form of vapor. |
| 11. | to emit vapor or exhalations. |
| 12. | to talk or act grandiloquently, pompously, or boastfully; bluster. |

vapor va·por (vā'pər)
n.
Barely visible or cloudy diffused matter, such as mist, fumes, or smoke, suspended in the air.
The state of a substance that exists below its critical temperature and that may be liquefied by application of sufficient pressure.
The gaseous state of a substance that is liquid or solid under ordinary conditions.
The vaporized form of a medicinal preparation to be administered by inhalation.
A mixture of a vapor and air, as an explosive mixture of gasoline and air burned in an internal-combustion engine.
vapors Exhalations within an organ, especially the stomach, supposed to affect the mental or physical condition. No longer in technical use.
vapors A nervous disorder such as depression or hysteria. No longer in technical use.