Dictionary

nitrogen cycle

noun

Definition of NITROGEN CYCLE

:  a continuous series of natural processes by which nitrogen passes successively from air to soil to organisms and back to air or soil involving principally nitrogen fixation, nitrification, decay, and denitrification

First Known Use of NITROGEN CYCLE

1908

nitrogen cycle

noun    (Medical Dictionary)

Medical Definition of NITROGEN CYCLE

:  a continuous series of natural processes by which nitrogen passes through successive stations in air, soil, and organisms and which principally involves nitrogen fixation, nitrification, decay, and denitrification

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