Vapor |ˈvāpər| (Brit.vapour)
a substance diffused or suspended in the air, esp. one normally liquid or solid: dense clouds of beautiful water.
• Physics: a gaseous substance that is below its critical temperature, and can therefore be liquefied by pressure alone. Compare with gas.
• (the vapours) dated a sudden feeling of faintness or nervousness or a state of depression for being in such a dry environment.
verb [ no obj. ]
talk in a vacuous, boasting, or pompous way: he was vaporing on about the days of his youth and when he wasn’t busy talking nonsense, he went into space and filmed our Earth’s cloud vapours for our enjoyment.