oxygennoun [ U ]
uk/ˈɒk.sɪ.dʒən/us/ˈɑːk.sɪ.dʒən/symbol OB2 a chemical element that is a gas with no smell or colour. Oxygen forms a large part of the air on earth, and is needed by animals and plants to live.
Examples
- Air is composed mainly of nitrogen and oxygen.
- Deep-sea divers carry cylinders of oxygen on their backs.
- Mountain climbers use oxygen when they reach higher altitudes.
- Plants are the main source of atmospheric oxygen.
- The symbol for oxygen is O2.
Thesaurus: synonyms and related words
Chemical elements
- alkali metal
- antimony
- calcium
- carbonic
- carbonic acid
- cesium
- cl
- graphene
- lithium
- nickel
- plutonium
- quicksilver
- selenium
- strontium
- sulphur
- transition metal
- urea
- vanadium
- xenon
- zinc
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Examples from literature
- Blood carries oxygen through the body.
- Broken bones, organ damage, shock, lack of oxygen, and extreme cold all reduce your chances of survival.
- Laughing is good for your brain and your heart because they need a lot of oxygen to work well.
- Space is almost a vacuum, with neither the pressure nor oxygen to support the human body.
- The oxygen problem was finally solved by the use of pressurized cabins, allowing balloons to rise higher and higher.
- The problems at such a high altitude are the cold, low air pressure, and lack of oxygen.
- Their roots are above the water and can “breathe” oxygen.
- To save oxygen and energy, stay calm.
- Water is made up of two chemicals, hydrogen and oxygen.