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

He was diagnosed with Legionnaires’ disease, which is a type of pneumonia contracted by inhaling contaminated water vapor. —Colin Mixson, New York Daily News, 20 Aug. 2025

As the air rises and cools, water vapor condenses into a cumulus-type cloud, with smoke, ash, and vapor particles acting as condensation nuclei, according to an explainer on NASA’s website exploring their evolution. —Brandi D. Addison, AZCentral.com, 1 Aug. 2025

However, Hu cautioned that the spectrum detected by the JWST could also be explained by an alternative model in which the atmosphere actually contains abundant water vapor. —Robert Lea, Space.com, 31 July 2025

Performance decreases with size, because less water vapor can escape from materials with tiny pores and thick boundaries—but there is a way to overcome this. —Elizabeth Rayne, ArsTechnica, 26 July 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for water vapor

• caper
• paper
• raper
• scraper
• shaper
• taper
• newspaper
• notepaper
• sandpaper
• skyscraper
• wallpaper
• wastepaper

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)