oxygen
The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
Other meanings
Molecular oxygen (O2), a colorless, odorless gas at room temperature.
“About 21% of the air you breathe is oxygen.”
A mixture of oxygen and other gases, administered to a patient to help them breathe.
A kind of
- chemical element
- gas
Kinds of oxygen
- liquid oxygen
Related words
- pyridoxine
- dioxin
- dioxygen
- gox
- heliox
- liquid oxygen
- lox
- nitrox
- nox
- oxo-
- oxy-
- oxygen bar
Example sentences
Word history
From Ancient Greek "ὀξύς" (sharp).
Where this comes from
This definition is adapted from “oxygen” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.