1A substance diffused or suspended in the air, especially one normally liquid or solid.‘dense clouds of smoke and toxic vapor’
haze, mist, spray, steam, water vapour, condensation, smoke, fumes, exhalation, fog, smog, murk, cloud, cloudiness, drizzle, dampness, humidity, mistiness, Scotch mist
- ‘chemical vapors’
- 1.1Physics A gaseous substance that is below its critical temperature, and can therefore be liquefied by pressure alone.Compare with gas
2the vapors dated A sudden feeling of faintness or nervousness or a state of depression.
- ‘a fit of the vapors’
Talk in a vacuous, boasting, or pompous way.
- ‘he was vaporing on about the days of his youth’
Late Middle English from Old French, or from Latin vapor ‘steam, heat’. The current verb sense dates from the early 17th century.