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bacillus

/bæˈsɪl.əs/ noun C2
  1. Any of various rod-shaped, spore-forming aerobic bacteria in the genus Bacillus, some of which cause disease.
  2. Any bacilliform (rod-shaped) bacterium.
  3. Something which spreads like bacterial infection. (figuratively)

Plural bacilli

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Then it was that the Madness of Manhattan, the frenzy of Fuss and Feathers, the Bacillus of Brag, the Provincial Plague of Pose seized upon Towers Chandler.
Six stories from The Four Million, p. 31 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.