Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun bacterium

1 sense of bacterium

Sense 1
bacteria, bacterium -- ((microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants)
       => microorganism, micro-organism -- (any organism of microscopic size)