noun, plural rhizobia [rahy-zoh-bee-uh] . Bacteriology.
any of several rod-shaped bacteria of the genus Rhizobium, found as symbiotic nitrogen fixers in nodules on the roots of the bean, clover, etc.

< Neo-Latin (1889), equivalent to rhizo- rhizo- + Greek (os) life (see bio-) + Latin -um noun suffix

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World English Dictionary
rhizobium (raɪˈzəʊbɪəm)
n , pl -bia
See also nitrogen fixation any rod-shaped bacterium of the genus Rhizobium, typically occurring in the root nodules of leguminous plants and able to fix atmospheric nitrogen
[C20: from rhizo- + Greek bios life]

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