nitrogen fixer

noun
any of various microorganisms in the soil involved in the process of nitrogen fixation.

Origin:
1910–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The crust is a nitrogen fixer, thus aids in plant growth.
Alder is also a natural nitrogen fixer, and contributes directly to stream
  productivity.
The goal is to find a good nitrogen fixer that doesn't grow much.
The plant is a nitrogen fixer and adaptable to poor infertile soils in full sun
  to part shade.
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