OXFORD DICTIONARY
nitrogen, n. Chem. a colourless tasteless odourless gaseous element that forms four-fifths of the atmosphere and is an essential constituent of proteins and nucleic acids.
nitrogen cycle the interconversion of nitrogen and its compounds, usu. in the form of nitrates, in nature. nitrogen fixation a chemical process in which atmospheric nitrogen is assimilated into organic compounds in living organisms and hence into the nitrogen cycle.
Symb.: N.
nitrogenous adj.
F nitrog{egrave}ne (as NITRO-, -GEN)
THESAURUS
nitrogen
acetylene, ammonia, argon, asphyxiating gas, butane, carbon dioxide, carbon monoxide, castor-bean meal, chlorine, coal gas, commercial fertilizer, compost, dressing, dung, enrichener, ethane, ether, ethylene, fertilizer, fluorine, formaldehyde, guano, helium, hydrogen, illuminating gas, krypton, lewisite, manure, marsh gas, methane, muck, mustard gas, natural gas, neon, night soil, nitrate, organic fertilizer, oxygen, ozone, phosphate, poison gas, propane, radon, sewer gas, superphosphate, xenon