From Longman Dictionary of Contemporary Englishvaporva‧por /ˈveɪpə $ -ər/ noun [countable, uncountable]x-refthe American spelling of vapourExamples from the Corpusvapor• He concludes that the mist is a vapor which stings the skin of man.• Then he turned his car around in the frozen street and disappeared in a cloud of vapor from the exhaust.• At any rate, maybe the fountains of vapor are still another attribute of the profounddignity and mystery of the whale.• The rarepassersbyhurried, emittingpuffs of vapor from their nostrils.• She was subsequently confined to the vaporbath of her home to die of suffocation.• The second is that the lightest molecule that can be made by combustion is water vapor.• Zubrin proposes using the Sabatier process to reacthydrogen with carbondioxide to make water vapor and methane.• The water vapor can then be cycled by reacting it with carbon monoxide to make carbon dioxide and hydrogen.• water vaporOriginvapor(1300-1400)Old Frenchvapeur, from Latinvapor"steam, heat"