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Definition of bacillus noun from the Oxford Advanced Learner's Dictionary

 

bacillus

 noun
noun
BrE BrE//bəˈsɪləs//
 
; NAmE NAmE//bəˈsɪləs//
 
(pl. bacilli
BrE BrE//bəˈsɪlaɪ//
 
; NAmE NAmE//bəˈsɪlaɪ//
 
)
 
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a type of bacteria. There are several types of bacillus, some of which cause disease. Word Origin late 19th cent.: from late Latin, diminutive of Latin baculus ‘stick’.
See the Oxford Advanced American Dictionary entry: bacillus