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单词 nitrogen
释义 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.
Usage
Symb.: N.
Phrases and idioms
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.
Derivatives
nitrogenous adj.
Etymology: F nitrog{egrave}ne (as NITRO-, -GEN)
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