Definition of nitrogen in English:


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(also N)
  • The chemical element of atomic number 7, a colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.

    ‘Plant tissue was ground in liquid nitrogen and the protein extracted as described earlier.’
    • ‘The data demonstrate that nitrogen and phosphorus are in especially short supply.’
    • ‘This may be due to the different functions of nitrogen and phosphorus in the plant.’
    • ‘Real snow was to have been made on site by spraying air, water, and liquid nitrogen under pressure.’
    • ‘A continuous flow of liquid nitrogen is then circulated through the probe into the lung and out again.’
    • ‘The samples were frozen in liquid nitrogen to prevent migration of the fluorescent compounds.’
    • ‘They are formed as a consequence of a layer of nitrogen in the upper atmosphere that also attacks ozone.’
    • ‘Ammonium is the reduced nitrogen form available to plants for assimilation into amino acids.’
    • ‘Their gas mix contains far less nitrogen than their air table or computer assumes they are breathing.’
    • ‘The white clover takes nitrogen from the air and puts it into the soil for the grass to feed on.’
    • ‘Obviously, vigorous shoots in high light attracted more nitrogen from other sources.’
    • ‘These are then carried to the chamber in which the coating will be applied by an inert carrier gas such as nitrogen.’
    • ‘Fertilisers contain high concentrations of nitrogen to help promote the growth of crops.’
    • ‘The study mapped where common heather was contaminated by nitrogen in excess of safety limits.’
    • ‘Seeds were not inoculated with rhizobia and plants were dependent on inorganic nitrogen.’
    • ‘Another approach is to apply less nitrogen and cut silage at the usual time of year.’
    • ‘The absorption of nitrogen by plants plays an important role in their growth.’
    • ‘This is a wasteful process causing a net loss of nitrogen to the animal and pollution of the environment.’
    • ‘This is where the body's tissues have been loaded by nitrogen and micro bubbles have been formed.’
    • ‘They rise during the day to find sunlight and sink to the depths at night, possibly to absorb nitrogen.’



/ˈnītrəjən/ /ˈnaɪtrədʒən/


Late 18th century from French nitrogène(see niter, -gen).