# semi-heavy water

> English word · Noun

## Definitions
1. A heavier form of water, containing one protium (normal hydrogen, ¹H) and one deuterium (heavy hydrogen, ²H) atom (thus, ¹H-²H-O).

## Etymology
From semi- + heavy water.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/semi-heavy-water