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English definition of “bacillus”

bacillus

noun [C]     /bəˈsɪl.əs/ (plural bacilli   /-aɪ/   ) specialized
a bacterium (= an extremely small organism) that is shaped like a rod. There are various types of bacillus, some of which can cause disease.Bacteria, moulds, germs and viruses
(Definition of bacillus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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