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English definition of “vapour”

vapour

noun (ILLNESS) UK (US vapor)     /ˈveɪ.pər/ US  /-pɚ/
the vapours old use UK (US the vapors) [plural] a condition in which someone suddenly feels ill and weak, usually because of a shockDisorders of muscles and the nervous system
(Definition of vapour noun (ILLNESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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