Definition of oxygen in English:

oxygen

noun

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

    ‘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’
    • ‘There seems to be less oxygen in town air on a very hot day, even in a quiet corner like Bath Place.’
    • ‘This oxygen may also support nitrifying bacteria that convert ammonia to nitrate.’
    • ‘He also had difficulty breathing and had to be given oxygen on arrival at hospital.’
    • ‘Solar panels power an electrolyser that separates water into hydrogen and oxygen.’
    • ‘The heart muscle is supplied with oxygen by blood arriving in the coronary arteries.’
    • ‘There may also be a greatly reduced oxygen content in the air at the bottom of deep wells.’
    • ‘Therefore in light plants gave out oxygen, but in the dark they emitted carbon dioxide.’
    • ‘It results from a temporary reduction in blood and oxygen supply to part of the brain.’
    • ‘The air in this chamber is very low in oxygen, so divers are advised not to remove their regulators.’
    • ‘On the one hand, there is the body's need for oxygen and its supply from the lungs.’
    • ‘Copper reacts with oxygen and carbon dioxide to form a greenish patina of copper carbonate.’
    • ‘Iron is needed to produce more blood to supply the baby with the necessary nutrients and oxygen.’
    • ‘The chemicals in tobacco reduce the flow of oxygen around the mother's blood stream.’
    • ‘This maintained the same concentration of oxygen in the gas flow at the point of analysis.’
    • ‘In addition, the very reactive singlet oxygen can be generated by an input of energy.’
    • ‘Despite the addition of oxygen and the issue of potash cartridges, the air is foul.’
    • ‘In other words, it is possible to die from a lack of oxygen, because of ozone poisoning.’
    • ‘Energy is generated by the reaction of hydrogen and oxygen across a catalytic membrane.’
    • ‘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.’

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/