- a variation of vapor.
vapour
Americannoun
noun
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particles of moisture or other substance suspended in air and visible as clouds, smoke, etc
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a gaseous substance at a temperature below its critical temperature Compare gas
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a substance that is in a gaseous state at a temperature below its boiling point
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rare something fanciful that lacks substance or permanence
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archaic a depressed mental condition believed originally to be the result of vaporous exhalations from the stomach
verb
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to evaporate or cause to evaporate; vaporize
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(intr) to make vain empty boasts; brag
Spelling
See -or 1.
Other Word Forms
Etymology
Origin of vapour
C14: from Latin vapor
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Hydrogen has often been touted as an environmentally-friendly future fuel because when burned the only by-product is water vapour.
From BBC • Apr. 21, 2026
"You could see the vapour trails where they had hit," he said.
From BBC • Feb. 28, 2026
One of the most important is a measure of how much moisture the atmosphere can extract from the land, known as the "vapour pressure deficit".
From BBC • Aug. 13, 2025
That means that as it approaches the Sun later this year, the energy from the Sun will heat the object's surface, leading to blazes of vapour and dust.
From BBC • Jul. 11, 2025
“I do so want you to be good! Please, please be good and ...” Two minutes later the Voice and the soma vapour had produced their effect.
From "Brave New World" by Aldous Huxley
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
