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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Overnight, officials were primarily concerned with high levels of volcanic gas such as water vapor, carbon dioxide and sulfur dioxide that can have far-reaching effects downwind. Eduardo Cuevas, USA Today, 27 May 2025 These release water vapors into the air, helping thin mucus and reduce nasal swelling. Lindsay Curtis, Health, 11 Apr. 2025 Hotter temperatures also evaporate more water vapor from lakes, oceans and vegetation. Mimi Montgomery, Axios, 7 Apr. 2025 The likes of oxygen and water vapor are the most obvious of such biosignatures, but others include ozone, methane, nitrous oxide, dimethyl sulphide and phosphine, to name a few. Keith Cooper, Space.com, 7 Apr. 2025 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 4 Jun. 2025.

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)
Last Updated: - Updated example sentences
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