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
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The exhaust fan in your bathroom works the same way the one over your stovetop removes steam, water vapor, and odors during cooking. Karen Brewer Grossman, Southern Living, 3 June 2026 The device uses high-voltage electricity to ionize a mixture of helium, air, and water vapor. Chris Young, Interesting Engineering, 2 June 2026 Its eruption sent enough salty water vapor into the stratosphere to fill around 58,000 Olympic-size swimming pools along with volcanic ash. Laura Paddison, CNN Money, 30 May 2026 The simulated collision matched a roughly 17-kilometer-wide impactor slamming into Mercury at speeds of up to 30 kilometers per second, generating a dense, temporary atmosphere rich in water vapor around the planet, the team reports in the new study. Sharmila Kuthunur, Space.com, 28 May 2026 See All Example Sentences for water vapor

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

Browse Nearby Words

Cite this Entry

“Water vapor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20vapor. Accessed 8 Jun. 2026.

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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