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nitrogen cycle the continuous natural cycle by which nitrogen passes from air to soil to organisms and back to air.
nitrogen dioxide a slightly toxic gas composed of nitrogen and oxygen, found in smog and automotive exhaust, and synthesized for use in nitration and oxidation, and as a catalyst.
nitrogen fixation any of various processes to convert atmospheric nitrogen into compounds with other elements, either naturally, as by bacteria, in leguminous plants or the soil, or chemically for industrial use, fertilizers, and the like.
nitrogen mustard any of a class of poisonous, burning compounds similar to mustard gas, used in treating cancer.
nitrogen oxide any of several compounds containing nitrogen and oxygen.