heavy water

noun

1

: the compound D₂O composed of deuterium and oxygen

called also deuterium oxide

2

: water enriched in deuterium

Examples of heavy water in a Sentence

Recent Examples on the Web

During that event, students will walk around the campus to see how heavy water feels when carrying it for long distances, Merlo said. —Julianna Lozada, Daily News, 23 Apr. 2026

The organization will partner with development banks and financial institutions with the intention of improving water systems against droughts and eventually strengthen job creation from jobs requiring heavy water usage. —Sasha Rogelberg, Fortune, 23 Apr. 2026

The partners worked on pairing fibers and constructions with wash techniques that do not require heavy water and chemical resources. —Angela Velasquez, Footwear News, 21 Apr. 2026

Late last week saw attacks on the nuclear power facility in Bushehr, a yellowcake production site in Yazd province, and a heavy water facility in Khondab, according to statements from the International Atomic Energy Agency. —Micah McCartney, MSNBC Newsweek, 31 Mar. 2026

Word History

First Known Use

1933, in the meaning defined at sense 1

Rhymes for heavy water

• annunciator
• imprimatur
• underwater
• backwater
• bathwater
• blackwater
• breakwater
• deepwater
• edgewater
• feedwater
• floodwater
• freshwater

Kids Definition

heavy water

noun

: water enriched in deuterium

Medical Definition

heavy water

noun

1

: the compound D₂O composed of deuterium and oxygen

called also deuterium oxide

2

: water having a higher-than-usual proportion of deuterium among its hydrogen atoms