rhizobium

n., pl., -bi·a (-bē-ə).
Any of various nitrogen-fixing bacteria of the genus Rhizobium that form nodules on the roots of leguminous plants, such as clover and beans.

[New Latin Rhizobium, genus name : RHIZO- + Greek bios, life.]

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The noun has one meaning:

Meaning #1: the type genus of Rhizobiaceae; usually occur in the root nodules of legumes; can fix atmospheric oxygen
  Synonym: genus Rhizobium

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