nitrogen
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. Symb.: N. 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. nitrogenous adj. [F nitrogne (as NITRO-, -GEN)]
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