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- DictionaryBa·cil·lus/bəˈsiləs/
noun
- 1. a rod-shaped bacterium.
noun
Bacilli is a taxonomic class of bacteria that includes two orders, Bacillales and Lactobacillales, which contain several well-known pathogens such as Bacillus anthracis (the cause of anthrax). Bacilli are almost exclusively gram-positive bacteria. The name Bacillus, capitalized and italicized, refers to a specific genus of bacteria. Wikipedia