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

Wildfire smoke consists of microscopic particulate matter, ash and trace minerals that, combined with water vapor, create the haze effect. — Ashley Mowreader, NBC news, 17 July 2026

Smoke from wildfires is made of water vapor, pollutants and particulate matter, which can penetrate the lungs and bloodstream, trigger systemic inflammation, exacerbate conditions like asthma and increase the risk of heart attacks and strokes. — Mary Whitfill Roeloffs, Forbes.com, 17 July 2026

Some of those gases react with oxygen and become carbon dioxide and water vapor in the air. — Kasha Patel, CNN Money, 17 July 2026

Hydrogen fuel cells generate electricity by combining hydrogen and oxygen, producing water vapor as the only direct emission. — ABC News, 17 July 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)