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English definition of “vapour”

vapour

noun [C or U] (GAS) UK (US vapor)     /ˈveɪ.pər/ US  /-pɚ/
gas or extremely small drops of liquid that result from the heating of a liquid or solid: The hollow glass tank contains hot mercury vapour. Poisonous vapours burst out of the factory during the accident.The state of matter
(Definition of vapour noun (GAS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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