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Nitrobacteriaceaenitrobacterium
Nitrobenzene
Nitrobenzol
Nitrocalcite
Nitrocarbol
Nitrocellulose
nitrochloroform
nitrochloromethane
nitrocotton
Nitroform
nitrofuran
nitrofurantoin
Nitrogelatin
Nitrogen
nitrogen balance
-- nitrogen cycle --
nitrogen dioxide
nitrogen fixation
nitrogen mustard
nitrogen narcosis
nitrogen oxide
nitrogen trichloride
nitrogenase
nitrogenise
Nitrogenize
Nitrogenous
Nitrogenous foods
Nitroglycerin
nitroglycerine
Nitrohydrochloric
nitrohydrochloric acid
Nitrol
nitrogen cycle
| Noun | 1. |  nitrogen cycle - the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil |