nitrogen
/ˈnʌɪtrədʒ(ə)n
/noun [mass noun]
The chemical element of atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent 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: bacteria in the root nodules of legumes have the capacity to fix nitrogen from the air (Symbol: N) 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.
Origin
Late 18th century: from French nitrogène (see nitre, -gen).
- phototube
- phototype
- phototypeset
- phototypesetter
- phototypesetting
- phototypic
- phototypist
- phototypographic
- phototypography
- phototypy
- photovisual
- photovoltaic
- photovoltaically
- photovoltaics
- photo work
- photoxidative
- photoxidise
- photoxidize
- photoxylography
- photozincograph
- photozincography
- photozincotype
- photronic
- Photuris
- photy