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

vapour

noun
 
/ˈveɪpə(r)/
 
/ˈveɪpər/
(US English vapor)
[countable, uncountable]
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  1. 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.
    Topics Weatherc1, Physics and chemistryc1
    Oxford Collocations Dictionaryadjective
    • water
    … of vapour/​vapor
    • cloud
    verb + vapour/​vapor
    • form
    • turn to
    • emit
    vapour/​vapor + verb
    • condense
    See full entry
    Word Originlate Middle English: from Old French, or from Latin vapor ‘steam, heat’.
See vapour in the Oxford Learner's Dictionary of Academic English

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