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water vapor
noun
: water in a vaporous form especially when below boiling temperature and diffused (as in the atmosphere)
Examples of water vapor in a Sentence
Recent Examples on the Web
The team calculated that Venus’ eruptions are at most 6 percent water vapor.
—Margherita Bassi, Smithsonian Magazine, 5 Dec. 2024
Powered by bomb cyclones and atmospheric rivers—long, narrow corridors of water vapor that deliver heavy precipitation—these storms boosted reservoir levels statewide.
—Mark R. Weaver, Newsweek, 4 Dec. 2024
Frost develops when temperatures drop below 32 degrees Fahrenheit, such that water vapor in the air freezes and forms thin layers of ice crystals on outside surfaces, including snow.
—Maia Pandey, Journal Sentinel, 11 Nov. 2024
Strong ARs transport water vapor roughly equivalent to 7.5 to 15 times the average flow of the Mississippi River.
—Nikki Nolan, CBS News, 20 Nov. 2024
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Word History
First Known Use
15th century, in the meaning defined above
Time Traveler
The first known use of water vapor was
in the 15th century
Dictionary Entries Near water vapor
Cite this Entry
“Water vapor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20vapor. Accessed 15 Dec. 2024.
Kids Definition
water vapor
noun
: water in a gaseous form especially when below boiling temperature and spread through the atmosphere
Medical Definition
water vapor
noun
: water in a vaporous form especially when below boiling temperature and diffused (as in the atmosphere)
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