Dictionary

nitrogen fixation

noun

Definition of NITROGEN FIXATION

:  the conversion of atmospheric nitrogen into a combined form (as ammonia) through chemical and especially biological action (as that of soil rhizobia)

First Known Use of NITROGEN FIXATION

1895

nitrogen fixation

noun    (Medical Dictionary)

Medical Definition of NITROGEN FIXATION

1
:  the industrial conversion of free nitrogen into combined forms useful especially as starting materials for fertilizers or explosives
2
:  the metabolic assimilation of atmospheric nitrogen by soil microorganisms and especially rhizobia and its release for plant use by nitrification in the soil on the death of the microorganisms

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