Definition of vapour noun from the Oxford Advanced Learner's Dictionary

 

vapour

 noun
(especially US English vapor)noun
BrE BrE//ˈveɪpə(r)//
 
; NAmE NAmE//ˈveɪpər//
 
[countable, uncountable] Sky
 
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a mass of very small drops of liquid in the air, for example steam water vapour The particles then form a vapour. There was a hissing sound, and clouds of vapour were emitted. See related entries: Sky Word Origin late Middle English: from Old French, or from Latin vapor ‘steam, heat’.

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