Definition of oxygen in English:

oxygen

(also O)

noun

mass noun
  • A colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.

    Oxygen is essential to plant and animal life and is a constituent of most organic compounds. It forms about 20 per cent of the earth's atmosphere, and is the most abundant element in the earth's crust, mainly in the form of oxides, silicates, and carbonates

    ‘if breathing stops, there is no oxygen getting to the brain and the cells begin to die’
    ‘hydrogen and carbon in the fuel combine with the oxygen in the air to form carbon dioxide and water’
    as modifier ‘an oxygen supply’
    • ‘Energy is generated by the reaction of hydrogen and oxygen across a catalytic membrane.’
    • ‘Solar panels power an electrolyser that separates water into hydrogen and oxygen.’
    • ‘In addition, the very reactive singlet oxygen can be generated by an input of energy.’
    • ‘Copper reacts with oxygen and carbon dioxide to form a greenish patina of copper carbonate.’
    • ‘On the one hand, there is the body's need for oxygen and its supply from the lungs.’
    • ‘The heart muscle is supplied with oxygen by blood arriving in the coronary arteries.’
    • ‘In other words, it is possible to die from a lack of oxygen, because of ozone poisoning.’
    • ‘It results from a temporary reduction in blood and oxygen supply to part of the brain.’
    • ‘It is important to minimize the new wine's exposure to oxygen, whatever its colour.’
    • ‘To avoid the production of oxygen via photosynthesis, plants were kept in the dark.’
    • ‘This maintained the same concentration of oxygen in the gas flow at the point of analysis.’
    • ‘There seems to be less oxygen in town air on a very hot day, even in a quiet corner like Bath Place.’
    • ‘There may also be a greatly reduced oxygen content in the air at the bottom of deep wells.’
    • ‘Iron is needed to produce more blood to supply the baby with the necessary nutrients and oxygen.’
    • ‘Therefore in light plants gave out oxygen, but in the dark they emitted carbon dioxide.’
    • ‘This oxygen may also support nitrifying bacteria that convert ammonia to nitrate.’
    • ‘The chemicals in tobacco reduce the flow of oxygen around the mother's blood stream.’
    • ‘He also had difficulty breathing and had to be given oxygen on arrival at hospital.’
    • ‘The air in this chamber is very low in oxygen, so divers are advised not to remove their regulators.’
    • ‘Despite the addition of oxygen and the issue of potash cartridges, the air is foul.’

Origin

Late 18th century from French (principe) oxygène ‘acidifying constituent’ (because at first it was held to be the essential component in the formation of acids).

Pronunciation

oxygen

/ˈɒksɪdʒ(ə)n/