# deuterium

> English word · Noun · IPA /djuːˈtɪəɹɪəm/ · frequency rank #43,601

## Definitions
1. An isotope of hydrogen with one proton and one neutron in each atom - 21H.
2. An atom of this isotope.

## Etymology
From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”).

## Common misspellings (12)
`ddeuterium`, `detuerium`, `deuetrium`, `deuteirum`, `deuterimu`, `deuteriumm`, `deuterrium`, `deuteruim`, `deutreium`, `deutterium`, `dueterium`, `eduterium`

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