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Definition of bacillus noun from the Oxford Advanced American Dictionary

 

bacillus

 noun
noun
NAmE//bəˈsɪləs//
 
(pl. bacilli
NAmE//bəˈsɪlaɪ//
 
)
 
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a type of bacteria. There are several types of bacilli, some of which cause disease.
See the Oxford Advanced Learner's Dictionary entry: bacillus