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

While there is no water vapor, JWST has picked up hints of solid particles of crystalline water-ice. — Keith Cooper, Space.com, 4 Sep. 2026

This internal process generates the necessary high heat and emits mostly water vapor, successfully driving the reaction forward without direct carbon emissions. — Mrigakshi Dixit, Interesting Engineering, 3 Sep. 2026

Even if El Niño’s temperature swings stayed exactly the same magnitude, its floods and droughts would still get worse in a warmer world because the hotter atmosphere holds more water vapor. — Jacek Krywko, ArsTechnica, 31 Aug. 2026

No other spacecraft has ever descended into the moon’s shadowy south polar craters, although NASA did crash a rocket into one in 2009 and watched a resultant plume of water vapor burst out. — Jonathan O'Callaghan, Scientific American, 20 Aug. 2026

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)