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rhizobium Syllabification: rhi·zo·bi·um
Pronunciation: /rīˈzōbēəm/

Definition of rhizobium in English:


A nitrogen-fixing bacterium that is common in the soil, especially in the root nodules of leguminous plants.
Example sentences
  • In an exciting paper, Fox describes how estrogen signals between plants and their symbiotic rhizobium soil bacteria can be disrupted by agricultural chemicals.
  • Since these two cover crops are legumes, they form a symbiosis with specialized soil bacteria called rhizobia.
  • Closer to the point of attachment to the root, membrane-bound compartments containing rhizobia are released into plant cells where the rhizobia differentiate into bacteroids, the form capable of fixing N 2.


1920s: modern Latin, from rhizo- 'root' + Greek bios 'life'.

Definition of rhizobium in:
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