Noun
A micro-organism such as a bacterium or yeast.
Usage- Dated
A bacterium of the species Bacteroides.
A symbiotic form of the nitrogen-fixing bacterium Rhizobia, or the root nodule that it produces.
Adjective
Resembling bacteria.
- Examples
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bacteroid particles
Adjective
resembling bacteria
Noun
a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants)