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Definition of bacillus: A variety of bacterium; a microscopic, rod-shaped vegetable organism.

Synonyms:

B, type B, vitamin B complex, vitamin B, barn, group B, boron, atomic number 5, bacilli

microorganism (part of speech: noun)

virus, zoospore, dyad, protozoa, animalcule, microphyte, microbe, microspore, paramecium, mastigopod, microorganism, zygote, bacteria, rotifer, amoeba, rhizopod, micrococcus, germ

See how do you define bacillus. See bacillus definition.