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[vey-per] /ˈveɪ pər/
noun, verb (used with object), verb (used without object), Chiefly British
Usage note
See -or1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for vapour
  • The warm sea water is pressurised to transform it into vapour which drives a turbine.
  • All water vapour clouds retain heat at night and reduce heat from the sun during the day.
  • Similarly, methane has no effect on climate because photons that methane blocks are already totally blocked by water vapour.
  • These are boxes containing air that is super-saturated with water vapour.
  • They then condense the vapour-a process that requires electricity.
  • The energy is used to heat the brine, partially evaporating it, and to condense the resulting water vapour.
  • Use it to power a car, for example, and water vapour is all that spills from the exhaust pipe.
  • Hotter air holds more water vapour, and so can produce more rain.
  • Concentrated seawater is left at the bottom of the chambers, and freshwater vapour condenses above.
  • Conversely, condensation from vapour to liquid liberates heat.
British Dictionary definitions for vapour


particles of moisture or other substance suspended in air and visible as clouds, smoke, etc
a gaseous substance at a temperature below its critical temperature Compare gas (sense 3)
a substance that is in a gaseous state at a temperature below its boiling point
(rare) something fanciful that lacks substance or permanence
(archaic) the vapours, a depressed mental condition believed originally to be the result of vaporous exhalations from the stomach
to evaporate or cause to evaporate; vaporize
(intransitive) to make vain empty boasts; brag
Derived Forms
vapourable, (US) vaporable, adjective
vapourability, (US) vaporability, noun
vapourer, (US) vaporer, noun
vapourish, (US) vaporish, adjective
vapourless, (US) vaporless, adjective
vapour-like, (US) vapor-like, adjective
vapoury, (US) vapory, adjective
Word Origin
C14: from Latin vapor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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