D₂O

See also: Appendix:Variations of "do"

Translingual

Symbol

D₂O

1. A molecule of heavy water, comprising two deuterium atoms and an oxygen atom.
2. (informal, uncountable) heavy water

Usage notes

IUPAC recommends that deuterium should be called by the chemical symbol "²H", not "D". It follows that heavy water should be called "²H₂O", not "D₂O".

Related terms

• H₂O, light water
• DHO, semi-heavy water

See also

• protium, hydrogen
• DHMO, dihydrogen monoxide