nitrogen-fixer

noun
ni·tro·gen-fix·er | \ ˈnī-trə-jən-ˈfik-sər \

Definition of nitrogen-fixer 

: any of various soil microorganisms that are involved in nitrogen fixation

First Known Use of nitrogen-fixer

1904, in the meaning defined above

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The first known use of nitrogen-fixer was in 1904

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