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

That’s why the best winter systems combine moisture-wicking inner fabrics with venting options and membranes whose pores let water vapor escape while keeping liquid water out. —Longji Cui, The Conversation, 26 Dec. 2025

Atmospheric rivers transport moisture from the tropics to northern latitudes in long, narrow bands of water vapor that form over an ocean and flow through the sky. —Arkansas Online, 25 Dec. 2025

According to the National Oceanic and Atmospheric Administration, atmospheric rivers are streams in the atmosphere that carry water vapors outside of the tropics. —Don Sweeney, Sacbee.com, 19 Dec. 2025

An atmospheric river is a band of water vapor that flows through the Earth's atmosphere and dramatically impacts the amount of rain and snow that falls. —Janet Loehrke, USA Today, 19 Dec. 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)