Origin and Etymology of rhizobium
New Latin, from rhiz- + Greek bios life — more at quick
First Known Use: 1890
Medical Definition of rhizobium
1 capitalized : a genus (family Rhizobiaceae) of small heterotrophic soil bacteria capable of forming symbiotic nodules on the roots of leguminous plants where they fix atmospheric nitrogen
2plural rhizobia \-bē-ə\play : any bacterium of the genus Rhizobium
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