bacteroid

From bacterium +‎ -oid.

bacteroid (plural bacteroids)

1. (dated) A micro-organism such as a bacterium or yeast.
2. A bacterium of the species Bacteroides.
3. A symbiotic form of the nitrogen-fixing bacterium Rhizobia, or the root nodule that it produces.

bacteroid (comparative more bacteroid, superlative most bacteroid)

1. (biology) Resembling bacteria.

   bacteroid particles