Bacillus definition

bə-sĭləs
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Any of various bacteria, especially a rod-shaped bacterium.
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Any of various rod-shaped, spore-forming, aerobic bacteria of the genus Bacillus that often occur in chains and include B. anthracis , the causative agent of anthrax.
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Any of a genus (Bacillus) of rod-shaped bacteria that occur in chains, produce spores, and are active only in the presence of oxygen.
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Any rod-shaped bacterium.
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(loosely) Any of the bacteria, esp. those causing disease.
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Any of various bacteria, especially a rod-shaped bacterium.
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Any of various rod-shaped, spore-forming, aerobic bacteria of the genus Bacillus that often occur in chains and include B. anthracis , the causative agent of anthrax.
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Any of various pathogenic bacteria, especially one that is rod-shaped.
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Any of various rod-shaped, spore-forming aerobic bacteria in the genus Bacillus, some of which cause disease.
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A taxonomic genus within the family Bacillaceae — certain rod-shaped bacteria.
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A taxonomic genus within the family Bacillidae — certain stick insects.
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Other Word Forms

Noun

Singular:
bacillus
Plural:
bacilli

Origin of bacillus

  • Late Latin diminutive of Latin baculum rod bak- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin bacillus (“small staff or wand, walking stick”).

    From Wiktionary

  • From Latin bacillus (“little staff, wand”).

    From Wiktionary