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Definition of vapor:

  1. A medicinal agent designed for administration in the form of inhaled vapor.
  2. An old name for hypochondria, or melancholy; the blues.
  3. Any substance in the gaseous, or aeriform, state, the condition of which is ordinarily that of a liquid or solid.
  4. In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.
  5. Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.
  6. To emit vapor or fumes.
  7. To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.
  8. To send off in vapor, or as if in vapor; as, to vapor away a heated fluid.
  9. To talk idly; to boast or vaunt; to brag.
  10. Wind; flatulence.


smoke, steam, dehydration, drying up, fog, desiccation, smog, exhalation, breath, vaporisation, condensation, vaporization, vapour, evaporation.

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